Tuesday is one of the biggest primary days of 2018.

In West Virginia, Republicans are wringing their hands over the possibility that Don Blankenship — the former coal executive imprisoned for violating mine safety standards after a mining explosion that killed dozens — will win the Senate primary. Blankenship, who has personally attacked Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellPelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Senate GOP aims to confirm Trump court pick by Oct. 29: report Trump argues full Supreme Court needed to settle potential election disputes MORE (R-Ky.) and his wife, Transportation Secretary Elaine Chao Elaine Lan ChaoChick-fil-A drops fight for San Antonio airport location Overnight Defense: US marks 19th anniversary of 9/11 attacks | Trump awards Medal of Honor to Army Ranger for hostage rescue mission | Bahrain, Israel normalizing diplomatic ties Trump marks 9/11 with moment of silence on Air Force One, remarks in PA MORE, is seen as putting a winnable race in jeopardy if he emerges victorious on Tuesday.

In Ohio, the high-profile race is on the Democratic side, where former Rep. Dennis Kucinich is seeking a comeback as Ohio’s governor against Richard Cordray Richard Adams CordrayConsumer bureau revokes payday lending restrictions Supreme Court ruling could unleash new legal challenges to consumer bureau Supreme Court rules consumer bureau director can be fired at will MORE, the former head of the Consumer Financial Protection Bureau and a key ally of Sen. Elizabeth Warren Elizabeth WarrenHarris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda Judd Gregg: The Kamala threat — the Californiaization of America GOP set to release controversial Biden report MORE (D-Mass.).

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Here are seven key races to watch on Tuesday.



GOP primary for West Virginia Senate

Blankenship’s surge over the weekend has scrambled West Virginia’s high-stakes GOP primary in the final days.

Two internal Republican polls showed Blankenship jumping into the lead over his two main rivals, Rep. Evan Jenkins Evan Hollin JenkinsWest Virginia New Members 2019 Republican Carol Miller holds off Democrat in West Virginia House race Trump to fundraise for 3 Republicans running for open seats: report MORE and state Attorney General Patrick Morrisey.

Blankenship has spent the bulk of his campaign railing against the establishment and McConnell. The West Virginia Republican ran an ad attacking McConnell as a “swamp captain” who has received money from his “China family.”

Blankenship’s momentum is a political headache for Republicans, who see the race as a top pickup opportunity this fall. Democratic Sen. Joe Manchin Joseph (Joe) ManchinThe Hill's Morning Report - Sponsored by Facebook - Trump, GOP allies prepare for SCOTUS nomination this week Trump meets with potential Supreme Court pick Amy Coney Barrett at White House Names to watch as Trump picks Ginsburg replacement on Supreme Court MORE is a top target for Republicans after President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE won the state by more than 40 points in 2016.

Republicans fear that a Blankenship victory on Tuesday would imperil their chances of unseating Manchin and expanding their slim Senate majority. Strategists are comparing the primary to Alabama’s special election, when Roy Moore Roy Stewart MooreVulnerable Senate Democrat urges unity: 'Not about what side of the aisle we're on' Sessions hits back at Trump days ahead of Alabama Senate runoff Judge allows Roy Moore lawsuit over Sacha Baron Cohen prank to proceed MORE won the Republican nomination with an anti-establishment primary campaign, only to blow what should have been a safe GOP seat to Sen. Doug Jones (D) after Moore was accused of sexual misconduct with teenagers.

Mountain Families PAC, a super PAC with ties to the national party, poured more than a million dollars into ads meant to soften up Blankenship. But Blankenship rebounded, prompting Trump to make an eleventh-hour plea for voters to reject him in favor of either Jenkins or Morrisey.

Jenkins and Morrisey have largely ignored Blankenship. But in the final days of the race, Morrisey turned up the heat on Blankenship, arguing that he’d cost Republicans a winnable seat in November.

GOP primary for Indiana Senate

Indiana also features a fierce, three-way primary to take on Democratic Sen. Joe Donnelly Joseph (Joe) Simon DonnellyTrump meets with potential Supreme Court pick Amy Coney Barrett at White House Names to watch as Trump picks Ginsburg replacement on Supreme Court Momentum growing among Republicans for Supreme Court vote before Election Day MORE, one of the most vulnerable Senate Democrats up for reelection.

Unlike in West Virginia, though, Republicans feel good about any of the three leading candidates advancing out of the primary to square off against Donnelly.

The primary was initially a two-person race between Reps. Luke Messer Allen (Luke) Lucas MesserK Street giants scoop up coveted ex-lawmakers Yoder, Messer land on K Street House GOP to force members to give up leadership positions if running for higher office MORE and Todd Rokita Theodore (Todd) Edward RokitaIndiana attorney general loses reelection bid after groping allegations Bottom Line Lobbying world MORE. But wealthy businessman and former state legislator Mike Braun’s entrance into the race upended the primary.

Braun, who has sought to position himself as an outsider, spent $5.4 million of his own money on the race. His self-funding has enabled him to wage a competitive campaign against Rokita and Messer.

Loyalty to Trump has been a huge factor in GOP primaries across the country, and the Hoosier State — which Trump won by 20 points — is no exception. Each of the three candidates has competed to position himself as the most dedicated Trump supporter in the race.

Messer, for example, introduced a resolution calling on Trump to be nominated for a Nobel Peace Prize. And Rokita introduced a resolution to end special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE’s Russia probe — unless evidence of collusion is produced — within 30 days.

Whoever wins the nomination will likely get Trump’s endorsement. The president plans to hold a campaign rally in Indiana two days after the primary.

GOP primary for Ohio Senate

Rep. Jim Renacci James (Jim) B. RenacciOhio is suddenly a 2020 battleground Democrats fear Ohio slipping further away in 2020 Medicare for All won't deliver what Democrats promise MORE is poised to clinch the GOP nomination to challenge Democratic Sen. Sherrod Brown Sherrod Campbell BrownSenate Democrats release report alleging Trump admin undermined fair housing policies Bipartisan praise pours in after Ginsburg's death Emboldened Democrats haggle over 2021 agenda MORE. But there’s been little public polling, making it hard to know where the primary race stands.

Renacci faces a challenge to the right from businessman Mike Gibbons, who has framed himself as the outsider in the race.

Trump, who won Ohio by 8 points in 2016, has endorsed Renacci — a big boost for the congressman.

But Renacci has recently endured a slew of unflattering headlines, including the news that he failed to disclose political donations while registered as a lobbyist.

Whoever wins the GOP nomination, Republicans acknowledge that their nominee will face an uphill fight against Brown, a populist progressive who polls well in his state.

Primaries for Ohio House special election

With Arizona’s unexpectedly close special election in the rearview mirror, both parties are turning their attention to the next high-profile special election: The fight to replace ex-Rep. Pat Tiberi Patrick (Pat) Joseph TiberiOhio New Members 2019 Many authors of GOP tax law will not be returning to Congress GOP Rep. Balderson holds onto seat in Ohio MORE (R-Ohio).

Democrats believe they can put another GOP stronghold into play, positioning themselves for an upset victory in a Republican district. Ohio’s 12th District — the most affluent and highest educated in the state — encompasses Columbus suburbs, but also extends to rural areas. Trump won the district by 11 points.

The high-stakes race has drawn candidates on both sides.

On the Republican side, state Sen. Troy Balderson has drawn support from the establishment wing — including Tiberi, a close ally of House leadership. Meanwhile, Liberty Township Trustee Melanie Leneghan has earned support from leading conservative figures including Rep. Jim Jordan James (Jim) Daniel JordanSunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election House passes resolution condemning anti-Asian discrimination relating to coronavirus Republicans call for Judiciary hearing into unrest in cities run by Democrats MORE (Ohio), who founded the House Freedom Caucus.

Other GOP candidates who have the potential to break through in the wide-open race include veteran Tim Kane, Delaware County prosecutor Carol O’Brien and state Sen. Kevin Bacon.

Meanwhile, a few leading candidates have emerged on the Democratic side.

Franklin County Recorder Danny O’Connor has earned local support and endorsements from Ohio Reps. Tim Ryan Timothy (Tim) RyanNow's the time to make 'Social Emotional Learning' a national priority Mourners gather outside Supreme Court after passing of Ruth Bader Ginsburg Lincoln Project hits Trump for criticizing Goodyear, 'an American company' MORE and Joyce Beatty Joyce Birdson BeattySharpton, police reform take center stage at National Mall Sanders raised over 0,000 for candidates in Tuesday primaries The Hill's Campaign Report: Progressives raise expectations ahead of big primary night MORE. Other candidates include former Franklin County Sheriff Zach Scott, who’s running as more of a moderate, and progressive activist John Russell.

Primaries for Ohio governor

The most high-profile contest for Democrats on Tuesday is the primary in Ohio’s open-seat race to replace GOP Gov. John Kasich, who is term-limited out of office.

Kucinich and Cordray are battling it out in a state that trended red in 2016. Both men have fashioned themselves as progressive populists, with the race pitting prominent progressives against one another.

While Cordray has earned support from more establishment parts of the party, Warren’s endorsement has also given him a big boost among liberals. Warren, who founded the Consumer Financial Protection Bureau, has campaigned for Cordray.

Meanwhile, Our Revolution, the outgrowth of Sen. Bernie Sanders Bernie SandersButtigieg stands in as Pence for Harris's debate practice Bernie Sanders warns of 'nightmare scenario' if Trump refuses election results Harris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda MORE’s (I-Vt.) 2016 presidential campaign, has gotten behind Kucinich — though Sanders himself has stayed on the sidelines. Kucinich, a former presidential candidate, is trumpeting his support for progressive ideals such as single-payer health care.

On the Republican side, state Attorney General Mike DeWine is running ahead of Lt. Gov. Mary Taylor. Both Republicans have sought to align closely with Trump, while keeping their distance from Kasich, an outspoken Trump critic.

GOP primary for Rep. Walter Jones Walter Beaman JonesExperts warn Georgia's new electronic voting machines vulnerable to potential intrusions, malfunctions Georgia restores 22,000 voter registrations after purge Stacey Abrams group files emergency motion to stop Georgia voting roll purge MORE’s seat

Rep. Walter Jones (R-N.C.), a longtime thorn in GOP leadership’s side, is facing a tough primary as he seeks to win one more term before retirement.

Jones has built a career on his willingness to break with the party. But while that independent streak isn’t new, opponent Scott Dacey is trying to frame Jones’s votes as an attack on the president’s agenda.

Dacey has hammered Jones for refusing to vote for the tax-reform bill and ObamaCare repeal — two bills Jones said raised concerns about fiscal responsibility — to try to frame Jones as anti-Trump.

But Jones has struck back by pointing to Dacey’s previous work as a federal lobbyist, questioning the challenger’s own commitment to Trump.

Available polling puts Jones ahead in the race, and he’s expected to win reelection in what he’s said will be his last race. But low-turnout primaries like these are difficult to predict, and the presence of a third candidate adds uncertainty to the race.

GOP primary for Rep. Robert Pittenger’s seat

Rep. Robert Pittenger Robert Miller PittengerBottom Line North Carolina reporter says there could be 'new crop' of GOP candidates in 9th Congressional District race North Carolina board calls for new election in contested House race MORE (R-N.C.) is facing another primary challenge from Republican Mark Harris, who nearly beat him in 2016. This time, though, the GOP congressman is expected to overcome the challenge more easily.

Harris, a conservative Baptist pastor, nearly defeated Pittenger the last time they faced off, losing by just 134 votes.

But recent polling shows Pittenger with a comfortable double-digit lead over his challenger.

The race has largely hinged on support for Trump, and both Pittenger and Harris have accused the other of disloyalty to the president. Both supported other Republican presidential candidates in the 2016 contest before ultimately backing Trump.

If Pittenger emerges from the primary, though, he’ll have another tough race ahead of him. He’ll likely face Democrat Dan McCready, a veteran and businessman who has outraised him. Democrats are heavily targeting the district, which Trump won by 11 points.

Ben Kamisar contributed.