7 Senate seats most likely to flip in 2018

Next year’s midterm elections will provide Republicans with a major opportunity to build their majority in the Senate — if they can overcome President Trump’s dismal approval ratings and internal party rancor.

The 2018 Senate map heavily favors Republicans, who will only defend eight seats, just two of which are considered vulnerable right now. By comparison, Democrats have to defend 25 seats, including 10 in states that Trump won in 2016.

Despite the rough landscape, Democrats received a handful of breaks in the early months of 2017. But with so few offensive opportunities, Democrats will have to thread the needle in deep-red states just to tread water. 

Here are the seven most vulnerable Senate seats of the 2018 midterm elections as they stand now. 

  1. Sen. Dean HellerDean Arthur HellerTrump suggests Heller lost reelection bid because he was 'hostile' during 2016 presidential campaign Trump picks ex-oil lobbyist David Bernhardt for Interior secretary Oregon Dem top recipient of 2018 marijuana industry money, study finds MORE (R-Nev.) 

Heller is the only Republican up for reelection in 2018 who represents a state that Hillary ClintonHillary Diane Rodham ClintonO’Rourke heading to Wisconsin amid 2020 speculation The Hill's 12:30 Report — Presented by Kidney Care Partners — Lawmakers scramble as shutdown deadline nears Exclusive: Biden almost certain to enter 2020 race MORE won last November. Making matters worse for Heller, he’s had a rough 2017. 

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His public wavering during the recent healthcare debate will hurt Heller in a state he won with only 46 percent of the vote in 2012, especially since his state accepted ObamaCare’s Medicaid expansion. By the end of the GOP ObamaCare repeal push, a poll from the Democratic-leaning Public Policy Polling found him with a 22 percent approval rating.

Democrats are largely falling in line behind Rep. Jacky Rosen (D-Nev.), a strong challenger with backing from former Senate Majority Leader Harry ReidHarry Mason ReidKlobuchar: 'I don't remember' conversation with Reid over alleged staff mistreatment Dems wary of killing off filibuster Reid praises Warren, stops short of endorsement MORE, the dean of Nevada Democrats. Rep. Dina Titus (D-Nev.) is still weighing a bid, but Democrats’ near-uniform support for Rosen could squeeze Titus out of the race and give the party more time to focus on Heller.

In the meantime, Rosen and Democratic groups have hammered Heller on his healthcare position. Perennial candidate Danny Tarkanian will challenge Heller in the GOP primary from the right, a fight that could hurt Heller with the Republican base. But as an incumbent, Heller will have heavy reinforcements from Washington Republicans who are committed to helping one of their own. 

  1. Sen. Claire McCaskillClaire Conner McCaskillMcCaskill: Lindsey Graham 'has lost his mind' Trey Gowdy joins Fox News as a contributor The Hill’s 12:30 Report: Trump AG pick Barr grilled at hearing | Judge rules against census citizenship question | McConnell blocks second House bill to reopen government MORE (D-Mo.)

McCaskill is one of the few statewide Democratic officeholders left in Missouri, which Trump won by 19 points in November. 

The two-term senator spent 2016 as one of Hillary Clinton’s top surrogates, mounting a strong defense of the Democratic presidential nominee that McCaskill’s rivals believe will become a weakness in her own campaign.

McCaskill’s party also just lost Missouri’s 2016 Senate race, despite a strong campaign from Democrat Jason Kander.

Missouri Attorney General Josh Hawley (R) continues to move closer to a bid, as key state Republicans push to unite around him after he won his 2016 election with more votes than Trump. And he’ll likely have some serious financial backing — Politico reported last week that the Club for Growth has banked $10 million to support Hawley.

But Hawley is new to elected office, and McCaskill is a strong fundraiser. She pulled in more than any of the other vulnerable Democratic incumbents in the second quarter of 2017, leaving her with $5.1 million in the bank.

  1. Sen. Joe DonnellyJoseph (Joe) Simon DonnellyOvernight Energy: Trump taps ex-oil lobbyist Bernhardt to lead Interior | Bernhardt slams Obama officials for agency's ethics issues | Head of major green group steps down Trump picks ex-oil lobbyist David Bernhardt for Interior secretary EPA's Wheeler faces grilling over rule rollbacks MORE (D-Ind.)

Donnelly leveraged a bipartisan approach to politics and his blue-collar appeal into a Senate seat in 2012, but he’ll have to fight yet another tough battle if he wants to keep his Senate seat in a state Trump won by 19 points.

Republican Reps. Todd Rokita and Luke Messer are engaged in a nasty primary. Messer is considered the more establishment Republican option, but Rokita surprised many observers with a strong second fundraising quarter where he outraised Messer by more than $400,000 and topped him in cash on hand.

The brutal primary could play to Donnelly’s favor, sapping resources from the eventual Republican nominee and leaving wounds that could take some time to heal. But Republicans are seizing on a recent report that Donnelly owned stock in a family company that outsources jobs to Mexico, even as he publicly criticized other companies for sending jobs out of the country. 

  1. Sen. Jeff FlakeJeffrey (Jeff) Lane FlakeTrump suggests Heller lost reelection bid because he was 'hostile' during 2016 presidential campaign Live coverage: Trump delivers State of the Union Sasse’s jabs at Trump spark talk of primary challenger MORE (R-Ariz.)

Flake wouldn’t rank this high in a normal election year, but a Republican president threatening to support a primary challenge to an incumbent GOP senator isn’t normal, either.

The Arizona senator’s path to reelection has grown more difficult as his feud with Trump heats up. Earlier in August, Trump called Flake “toxic” in a tweet where he applauded Kelli Ward, Flake’s primary opponent. And the president's upcoming Tuesday rally in Arizona could give him a stage to take more shots at Flake or even officially endorse a primary opponent.

Complicating Flake’s path is Democratic Rep. Kyrsten Sinema, who confirmed this week that she’s still considering a bid.

Flake will have the backing of the National Republican Senatorial Committee and a score of outside groups that look to protect GOP incumbents, whether or not they have Trump’s support. And Republicans have so far been successful at keeping a statewide Democratic push at bay. But keep an eye on how far Trump is willing to go in the primary — that could be a major factor.  

  1. Sen. Joe ManchinJoseph (Joe) ManchinSenate confirms Trump pick William Barr as new attorney general GOP wants to pit Ocasio-Cortez against Democrats in the Senate Senate poised to confirm Trump’s attorney general pick MORE (D-W.Va.)

In 2016, West Virginia went for Trump by a larger margin than any other state — 42 points.

That resounding victory hasn’t been lost on Manchin, who’s made it a point to try to work with the president and Senate GOP colleagues. Another factor counting in his favor: Manchin’s consistent record of winning statewide office in the West Virginia since 2001, despite the state’s rightward drift.

But Trump’s popularity in West Virginia has drawn interest from strong Republican candidates, and the winner will pose a serious threat to Manchin’s political future. And Democrats can’t be encouraged by Gov. Jim Justice’s decision to ditch them and become a Republican last month, a decision he announced with Trump at his side.

Rep. Evan Jenkins (R-W.Va.) and West Virginia Attorney General Patrick Morrisey (R) are locked in another tough primary, as each tries to capture the mantle of being the “true conservative” in the race. The gloves have come off as Jenkins tries to frame Morrisey as late to the Trump bandwagon, while Morrisey focuses on Jenkins’s history as a Democratic state legislator. 

  1. Sen. Heidi HeitkampMary (Heidi) Kathryn HeitkampOvernight Energy: Trump taps ex-oil lobbyist Bernhardt to lead Interior | Bernhardt slams Obama officials for agency's ethics issues | Head of major green group steps down Trump picks ex-oil lobbyist David Bernhardt for Interior secretary On The Money: Shutdown Day 27 | Trump fires back at Pelosi by canceling her foreign travel | Dems blast 'petty' move | Trump also cancels delegation to Davos | House votes to disapprove of Trump lifting Russia sanction MORE (D-N.D.)

Heitkamp hails from another deep-red state — North Dakota went for Trump by about 36 points. 

Like Manchin, Heitkamp has walked the line between the party’s opposition to Trump and his popularity among her constituents — briefly floated as a potential Agriculture Secretary, Heitkamp, like Manchin, voted for more than two-thirds of Trump’s Cabinet appointments.

While Heitkamp hasn’t announced whether she’ll run for reelection, her steady fundraising pace keeps the door for another bid wide open. Heitkamp had $3 million in the bank as of the end of June — more than half the total she spent during her entire 2012 bid. 

Heitkamp received her first challenger this week when state Sen. Tom Campbell, who is framing himself as an outsider who better exemplifies the values of voters in the conservative state, entered the race. Campbell might not have the primary field to himself, though — Rep. Kevin Cramer (R) is mulling a bid of his own.

  1. Sen. Jon TesterJonathan (Jon) TesterGOP braces for Trump's emergency declaration Border talks stall as another shutdown looms Mulvaney: Government shutdown on the table MORE (D-Mont.) 

Republicans have a lot to like about their Montana prospects. Trump won the state by more than 20 points in November, and Republican Greg Gianforte just won the state’s at-large congressional seat in a special election — even after he assaulted a reporter.

Tester has never hit 50 percent in either of his two Senate bids, winning each election with 49 percent after a libertarian candidate siphoned off part of the vote. 

But Tester, a former chairman of the Democratic Senatorial Campaign Committee, is no stranger to a tough fight and has forged his own brand in the state separate from the national Democratic Party that’s allowed him to outperform a typical Democratic candidate.

Republicans are going into battle without the candidates they wanted, as former Rep. Ryan ZinkeRyan Keith ZinkeOvernight Energy: Zinke joins Trump-tied lobbying firm | Senators highlight threat from invasive species | Top Republican calls for Green New Deal vote in House Zinke, Lewandowski join Trump veterans’ lobbying firm Is a presidential appointment worth the risk? MORE (R-Mont.) is now secretary of the Interior and Attorney General Tim Fox opted to run for governor instead. State Auditor Matt Rosendale appears to be the favorite in the GOP, with businessman Troy Downing and state Sen. Albert Olszewski also in the mix.

Other races to watch

There are five other Democrats running in states Trump won — Sens. Bill NelsonClarence (Bill) William Nelson2020 party politics in Puerto Rico There is no winning without Latinos as part of your coalition Dem 2020 candidates court Puerto Rico as long nomination contest looms MORE (Fla.), Bob CaseyRobert (Bob) Patrick CaseyGOP wants to pit Ocasio-Cortez against Democrats in the Senate Biden speaking to Dems on Capitol Hill as 2020 speculation mounts: report GOP senators: Trump should not declare border emergency during State of the Union MORE Jr. (Pa.), Tammy BaldwinTammy Suzanne BaldwinDems offer smaller step toward ‘Medicare for all' Overnight Health Care — Sponsored by America's 340B Hospitals — Powerful House committee turns to drug pricing | Utah governor defies voters on Medicaid expansion | Dems want answers on controversial new opioid Why does the bankruptcy code discriminate against disabled veterans? MORE (Wis.), Debbie StabenowDeborah (Debbie) Ann StabenowThe Hill's Morning Report - Presented by the American Academy of HIV Medicine - Will there be any last-minute shutdown drama? Overnight Health Care — Sponsored by America's 340B Hospitals — Utah tests Trump on Medicaid expansion | Dems roll out Medicare buy-in proposal | Medicare for all could get hearing next month | Doctors group faces political risks on guns Dems offer smaller step toward ‘Medicare for all' MORE (Mich.) and Sherrod BrownSherrod Campbell BrownShep Smith: Signing funding bill is a 'loss' for Trump no matter how it's packaged Exclusive: Biden almost certain to enter 2020 race Tim Ryan ‘seriously considering’ 2020 bid MORE (Ohio). These five do not yet seem as vulnerable as the others, but the races could move up the rankings depending on how primaries shake out.  

Florida Republicans are in a holding pattern as Gov. Rick Scott (R) weighs a bid, since his entry would immediately clear the field and give Nelson a top-tier challenger. Casey and Baldwin are waiting to see how the large GOP primary fields taking them on shake out.

Musician Kid Rock is mulling a bid against Stabenow. And Brown could face a rematch against his 2012 opponent, state treasurer Josh Mandel, but some state Republicans aren’t excited about his campaign and are looking for other options.