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 HellerThis week: Barr back in hot seat over Mueller report Trump suggests Heller lost reelection bid because he was 'hostile' during 2016 presidential campaign Trump picks ex-oil lobbyist David Bernhardt for Interior secretary 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 HeitkampThe Hill's Morning Report — Biden steadies in third debate as top tier remains the same Trump wins 60 percent approval in rural areas of key states Pence to push new NAFTA deal in visit to Iowa 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 CramerPrimary challenges show potential cracks in Trump's GOP Castro, Steyer join pledge opposing the Keystone XL pipeline EPA proposes rolling back states' authority over pipeline projects 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 TrumpMarine unit in Florida reportedly pushing to hold annual ball at Trump property Giuliani clashes with CNN's Cuomo, calls him a 'sellout' and the 'enemy' Giuliani says 'of course' he asked Ukraine to look into Biden seconds after denying it 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 McCaskillEx-CIA chief worries campaigns falling short on cybersecurity Ocasio-Cortez blasts NYT editor for suggesting Tlaib, Omar aren't representative of Midwest Trump nominees meet fiercest opposition from Warren, Sanders, Gillibrand 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 DonnellyLobbying world Trump nominees meet fiercest opposition from Warren, Sanders, Gillibrand GOP frets over nightmare scenario for Senate primaries 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 FlakeFlake donates to Democratic sheriff being challenged by Arpaio in Arizona The Hill's Morning Report - Trump says US-China trade talks to resume, hails potential trade with Japan, UK Joe Arpaio to run for Maricopa County sheriff in 2020  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 McSallyArizona Democrats push Sinema censure vote off until January Pence taps former DHS spokeswoman as his new press secretary Arizona Democratic Party will hold vote to censure Sinema 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 ClintonGiuliani says 'of course' he asked Ukraine to look into Biden seconds after denying it Sanders hits 1 million donors Democrats will not beat Trump without moderate policy ideas MORE.

But he’s managed to stay in his race against Rep. Jacky RosenJacklyn (Jacky) Sheryl RosenHillicon Valley: Trump seeks review of Pentagon cloud-computing contract | FTC weighs updating kids' internet privacy rules | Schumer calls for FaceApp probe | Report says states need more money to secure elections Senators introduce legislation to boost cyber defense training in high school Key endorsements: A who's who in early states 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 senators quietly hope Biden wins over rivals GOP Sen. Johnny Isakson to resign at end of year Native American advocates question 2020 Democrats' commitment 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 TrumpDemocrats introduce bill to block taxpayer-funded spending at Trump properties Trump dismisses NYT explanation on Kavanaugh correction The Hill's Morning Report - Trump takes 2020 roadshow to New Mexico 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 NelsonMedia and candidates should be ashamed that they don't talk about obesity Al Franken says he 'absolutely' regrets resigning Democrats target Florida Hispanics in 2020 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 McConnellPatagonia says to shut stores for a few hours during Global Climate Strike Overnight Health Care — Presented by Partnership for America's Health Care Future — Pelosi unveils signature plan to lower drug prices | Trump says it's 'great to see' plan | Progressives pushing for changes On The Money: House votes to avert shutdown, fund government through November | Judge blocks California law requiring Trump tax returns | Senate panel approves three spending bills 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) ManchinSchumer: I don't know any 'Democrat who agrees' with O'Rourke on gun seizures O'Rourke: Many Democrats 'complicit' in gun problem The Hill's Morning Report - Pompeo condemns Iran for 'act of war' while Trump moves with caution 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 CorkerTrump announces, endorses ambassador to Japan's Tennessee Senate bid Meet the key Senate player in GOP fight over Saudi Arabia Trump says he's 'very happy' some GOP senators have 'gone on to greener pastures' 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 BlackburnTaylor Swift 'obsessed' with politics, says she's cautious about celebrity support backfiring for Democrats The evolution of Taylor Swift's political activism Kellyanne Conway responds to Taylor Swift criticism by invoking pop star's lyrics 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 CruzCruz endorses GOP candidate for Senate in New Hampshire Missouri Republican wins annual craft brewing competition for lawmakers GOP signals unease with Barr's gun plan 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.