The top Senate seats most likely to flip

Senate Republicans believe they are on the cusp of increasing their majority in the midterm elections despite historic headwinds that seem likely to cost the GOP control of the House.

Republicans believe they have growing momentum to pick up seats in North Dakota, Missouri and Indiana, while races in Montana and Florida remain tight.

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The GOP is feeling more bullish about not losing any of their own incumbents up for reelection, a significant turnaround from earlier in the cycle when Nevada Sen. Dean HellerDean Arthur HellerOn The Trail: Democrats plan to hammer Trump on Social Security, Medicare Lobbying World Democrats spend big to put Senate in play MORE was seen as possibly the most endangered Senate incumbent standing.

Surprises are still possible on Tuesday in a quickly changing environment.

Here's a look at the Senate seats more likely to flip:

North Dakota

Sen. Heidi HeitkampMary (Heidi) Kathryn Heitkamp70 former senators propose bipartisan caucus for incumbents Susan Collins set to play pivotal role in impeachment drama Pro-trade group launches media buy as Trump and Democrats near deal on new NAFTA MORE (D-N.D.) is viewed as the most vulnerable Democratic incumbent in the final weeks before the midterm elections, as she’s trailed behind Rep. Kevin CramerKevin John CramerThe Hill's Morning Report - Sanders takes incoming during intense SC debate Hillicon Valley: Twitter falling short on pledge to verify primary candidates | Barr vows to make surveillance reforms after watchdog report | DHS cyber chief focused on 2020 Barr says he'll make surveillance reforms after damning watchdog report MORE (R-N.D.) in the polls.

Democrats aren’t counting Heitkamp out after she squeaked out a victory in 2012. They argue that Heitkamp still has a path if she can hit her targets in the eastern part of the state, win over moderates and turn out Native American voters.

The election will come less than a week after tribes unsuccessfully challenged a voter ID law that requires a current address for the identification to be valid. Native Americans strongly backed Heitkamp in 2012.

Though recent polls have shown a slight tightening in the race, Heitkamp is behind in the polls by an average of more than 11 percentage points, according to RealClearPolitics.

The race is being handicapped by election watchers as leaning toward Republicans. And President TrumpDonald John TrumpTrump passes Pence a dangerous buck Overnight Health Care — Presented by American Health Care Association — Trump taps Pence to lead coronavirus response | Trump accuses Pelosi of trying to create panic | CDC confirms case of 'unknown' origin | Schumer wants .5 billion in emergency funds Trump nods at reputation as germaphobe during coronavirus briefing: 'I try to bail out as much as possible' after sneezes MORE, in a sign that Republicans are feeling good about the state, isn’t expected to make a campaign stop in the final days before the election.

Missouri

Sen. Claire McCaskillClaire Conner McCaskill70 former senators propose bipartisan caucus for incumbents Democrats criticize Medal of Freedom for Limbaugh as 'slap in the face' Kansas City, Kan., responds to Trump tweet: We root for the Chiefs, too MORE (D-Mo.) has been a top target since the start of the cycle, with Republicans convinced they would have beaten her in 2012 if her GOP opponent, then-Rep. Todd Akin (Mo.), hadn’t sparked a political firestorm by saying that female bodies have a way of preventing pregnancy from “legitimate rape.”

But she’s managed to keep her race close despite Trump winning her state by roughly 15 percentage points in 2016.

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Several polls in the final month before the midterms, including a Fox News poll released last week, have shown the race between McCaskill and Attorney General Josh Hawley (R) locked in a tie. Others have Hawley with a slight lead but well within the margin of error.

McCaskill has tried to align herself with Trump and distance herself from the more progressive elements in her party, telling Fox News that she isn’t one of those “crazy Democrats” and that she “100 percent” supports Trump blocking a migrant caravan from entering the country.

But her strategy earned her no reprieve from Trump, who said during a rally in Missouri days before the midterms that the voters would “retire far-left Democrat Claire McCaskill.”

Indiana

Democratic Sen. Joe DonnellyJoseph (Joe) Simon Donnelly70 former senators propose bipartisan caucus for incumbents Ginsburg health scare raises prospect of election year Supreme Court battle Watchdog accuses pro-Kavanaugh group of sending illegal robotexts in 2018 MORE (Ind.) is trying to hold on to his seat in a state Trump won by roughly 16 points in 2016 and where he is the lone Democrat to hold a statewide office.

Donnelly has tried to tie himself to Trump, including becoming the first Democratic senator to open the door to considering Trump’s controversial effort to change who qualifies for birthright citizenship.

A Fox News Poll showed Donnelly with a 7-point lead over businessman Mike Braun. But the race remains rated a toss-up, with Republicans viewing it, Missouri and North Dakota as their best chances to pick up seats currently held by Democrats.

Arizona

Arizona is emerging as Democrats’ best shot to flip a Republican-held seat in an otherwise brutal Senate midterm map.

Republicans hoped that when Sen. Jeff FlakeJeffrey (Jeff) Lane Flake70 former senators propose bipartisan caucus for incumbents McSally ties Democratic rival Kelly to Sanders in new ad McSally launches 2020 campaign MORE (R-Ariz.), a frequent critic of the president, announced his retirement last year it would give the party a better shot at protecting the Senate seat.

But while Republicans got the candidate they wanted when Rep. Martha McSallyMartha Elizabeth McSallyLoeffler releases new ad targeting Sanders's 'socialism' GOP casts Sanders as 2020 boogeyman Overnight Health Care: Officials confirm 34 total coronavirus cases in US | ObamaCare favorability hits highest level in poll | McSally unveils bill to lower drug prices amid tough campaign MORE (R-Ariz.) managed to survive a brutal primary election, she’s remained locked in a tight battle with Rep. Kyrsten Sinema (D-Ariz.).

Unlike in Nevada, where Democrats are trying to unseat an incumbent, the open race appears to be giving Sinema and her party an easier, but still heavy, lift.

Sinema is leading in the race on average by a percentage point, according to RealClearPolitics. And a Fox News poll released last week had the race locked in a tie.

Nevada

Heller has been a top target since the start of the 2018 cycle as the only Senate Republican running for reelection in a state won by Hillary ClintonHillary Diane Rodham ClintonDNC warns campaigns about cybersecurity after attempted scam Biden looks to shore up lead in S.C. Stone judge under pressure over calls for new trial MORE.

But he’s managed to stay in his race against Rep. Jacky RosenJacklyn (Jacky) Sheryl RosenOvernight Defense: Lawmakers tear into Pentagon over .8B for border wall | Dems offer bill to reverse Trump on wall funding | Senators urge UN to restore Iran sanctions Bipartisan Senate resolution would urge UN to renew Iran arms embargo, travel restrictions Schumer reminds colleagues to respect decorum at State of the Union speech MORE (D-Nev.) despite being targeted by more than $33.5 million in negative spending from outside groups.

Heller has stuck closely to Trump as he’s searched for a path to victory in the battleground state, and RealClearPolitics shows he’s leading by 2 percentage points on average.

But, in a potential sign of trouble for Heller, Democrats are leading in the state’s early voting tally by roughly 3.5 percent, which will put pressure on the GOP senator to drive up his margin among independents on Tuesday. And after predicting a Heller victory in 2012, Jon Ralston, a veteran Nevada political observer, said on Sunday he believes Heller will lose this year.

Montana

How close the race in Montana is during the waning days of the 2018 election cycle depends on which party you ask.

Democrats, while acknowledging the race is close, are quick to note Sen. Jon TesterJonathan (Jon) TesterDemocratic senator: 'The ultimate of ironies' for Trump to hit Romney for invoking his faith Committee on Veterans Affairs sends important message during tense Senate time Democrats cry foul over Schiff backlash MORE (D-Mont.) has maintained a steady lead in the polls for weeks despite months of battering by Trump and Donald Trump Jr.Donald (Don) John TrumpTrump Jr., Meadows wear matching Trump jackets on 'Fox & Friends' Group auctioning off hunting trip with Donald Trump Jr. Trump allies to barnstorm Iowa for caucuses MORE

Tester, according to RealClearPolitics, has a more than 4-point lead on average. But other recent polls show the race being as narrow as 2 or 3 percentage points, putting it within the margin of error.

Republicans are more bullish, believing the Tester-Trump feud has moved the race their way. And Republicans are hoping that a last-minute visit by Trump, who remains deeply popular in the state, will help vault Matt Rosendale into the lead just in time for Tuesday.

Florida

Democrats are feeling bullish about Sen. Bill NelsonClarence (Bill) William NelsonThe most expensive congressional races of the last decade Lobbying world Bottom Line MORE’s chances in Florida despite Gov. Rick Scott having gone up with TV ads months before Nelson and pouring more than $63 million into his race to defeat the incumbent.

The Democratic Senatorial Campaign Committee on Friday pointed to early Republican optimism about the race as an example of a “GOP talking point busts,” noting that Senate Majority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellOvernight Health Care — Presented by American Health Care Association — Trump taps Pence to lead coronavirus response | Trump accuses Pelosi of trying to create panic | CDC confirms case of 'unknown' origin | Schumer wants .5 billion in emergency funds Push for national popular vote movement gets boost from conservatives To avoid November catastrophe, Democrats have to KO Sanders MORE’s (R-Ky.) prediction that Democrats would leave Nelson “for dead” by mid-September didn’t pan out.

Democrats point to two main factors as the reason for their optimism: The composition of Florida, which has the reputation as a swing state, and the excitement over Tallahassee Mayor Andrew Gillum, the Democratic gubernatorial nominee.

Nelson only has a narrow 2-point lead in the race according to several polls, but FiveThirtyEight gives him a 2-in-3 chance of keeping the seat.

West Virginia

Sen. Joe ManchinJoseph (Joe) ManchinThe Hill's Morning Report - Sanders takes incoming during intense SC debate Republicans root for Sanders nomination in battle for House Overnight Health Care — Presented by American Health Care Association — Lawmakers raise alarms over Trump coronavirus response | Top official warns virus appears inevitable in US | Democrats block two Senate abortion bills MORE was initially viewed as one of the most vulnerable Democratic incumbents up for reelection in a state won by Trump by roughly 42 points — his biggest margin of victory in 2016.

But while many of his red-state colleagues have seesawed in and out of front-runner status in their respective races, Manchin has maintained a solid lead over Attorney General Patrick Morrisey in public polling in the state over for weeks.

Strategists in both parties attribute his advantage to his gifts as a retail politician and name ID in a state where he served as governor before joining the Senate.

Republicans are hoping a final visit by Trump to the state could provide Morrisey with momentum heading into election day.

But The Washington Post reported that the Senate Leadership Fund, a super PAC aligned with McConnell, is no longer airing television advertisements in the Mountain State.

Tennessee

Democrats’ hopes of picking up retiring GOP Sen. Bob CorkerRobert (Bob) Phillips CorkerMcConnell, Romney vie for influence over Trump's trial RNC says ex-Trump ambassador nominee's efforts 'to link future contributions to an official action' were 'inappropriate' Lindsey Graham basks in the impeachment spotlight MORE’s Senate seat appear to be fading.

Former Gov. Phil Bredesen, like other red-state Democrats, has played up his support for border security as Trump has hammered on the issue in the closing days of the campaign, even releasing an ad touting his decision to send military personnel to the border.

But GOP Rep. Marsha BlackburnMarsha BlackburnHouse Freedom Caucus chairman endorses Collins's Georgia Senate bid TikTok introduces new parental controls Abortion wars flare up in Congress MORE (Tenn.) has led in all but one recent public poll, and two polls released during the final week of the election have her with an 8-point and 9-point lead, respectively.

Texas

Sen. Ted CruzRafael (Ted) Edward CruzSteyer calls for Senate term limits to pass gun control legislation Cruz targets California governor over housing 'prescriptions' This week: House to vote on legislation to make lynching a federal hate crime MORE’s race against Rep. Beto O’Rourke (R-Texas) has captured the national spotlight, dominating media coverage and raking in historic levels of fundraising for a Senate fight in a deeply red state like Texas.

Democrats point to the fact that O’Rourke is getting targeted with roughly $7.7 million in negative outside group spending as a sign that they’ve put Republicans on defense in what could have been a sleeper Senate race.

But national attention aside, Cruz has maintained a steady, high single-digit lead in the polls, and Republicans believe the fundamentals of the conservative state — which hasn’t sent a Democrat to the Senate since 1988 — will allow Cruz to win on Tuesday.