Five takeaways from Ohio's too-close-to-call special election

Republicans are clinging to a razor-thin lead in Ohio’s hotly contested House special election.

It was a race the GOP had expected to win easily but that ended up demonstrating the high level of Democratic enthusiasm ahead of the midterm elections in November.

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The race in Ohio's 12th District was too close to call as of late Tuesday night, with Republican state Sen. Troy Balderson leading Democrat Danny O’Connor by less than a percentage point. At least 3,367 provisional ballots were yet to be counted, making the outcome unknown, potentially for days.

Republicans may have avoided an electoral disaster, but the closeness of the race provided ominous signs for the party as it looks to hang on to its 23-seat majority in the House in November.

Meanwhile, female candidates swept the field in other races on Tuesday, providing more signs that 2018 could indeed end up the “Year of the Woman.” And the ultimate impact of President TrumpDonald John TrumpJimmy Carter: 'I hope there's an age limit' on presidency White House fires DHS general counsel: report Trump to cap California trip with visit to the border MORE's endorsements — and of progressive stars Sen. Bernie SandersBernie SandersJimmy Carter: 'I hope there's an age limit' on presidency 2020 candidates keep fitness on track while on the trail Mark Mellman: The most important moment in history? MORE (I-Vt.) and Alexandria Ocasio-Cortez — in various races proved to be uncertain.

Here are the key takeaways from Tuesday’s races:

GOP leads, but Dems see bright spots

O’Connor may be down, but the Democrats are not out.

Democrats were able to make a genuine contest for a seat that has been in Republican hands for decades, showing further signs that Trump may be struggling with suburban voters in Ohio's 12th District.

Also helping: Democrats recruited a young candidate who campaigned hard and sought to appeal to moderate voters, without demonizing Trump — a similar strategy that Rep. Conor Lamb (D) used to win a special House election in Pennsylvania in March.

Republicans sought to make House Minority Leader Nancy PelosiNancy PelosiPelosi: Democrats will 'certainly' beat Trump in 2020 Kavanaugh impeachment push hits Capitol buzz saw Lewandowski, Democrats tangle at testy hearing MORE (D-Calif.) a key issue in the campaign, trying to closely tie O'Connor to her, but the Democrat appears to have been largely able to overcome the attacks and keep the race close, despite an MSNBC interview in which the candidate admitted he would ultimately support whomever the party nominated as leaders.

GOP may be in genuine trouble in the suburbs

The race showed Republicans may have a potential problem on their hands in suburban districts.

Democrats are targeting well-educated voters and women residing in the suburbs who have historically backed Republicans but who are frustrated with the president and want members of Congress who will be a check on him.

There are 68 other GOP-held seats that are more favorable for Democrats than Ohio's 12th District. Of those seats, Trump won 45 by a smaller margin than in Ohio. And the other 23 seats are held by Republicans but won by Democratic presidential nominee Hillary ClintonHillary Diane Rodham ClintonGOP struggles with retirement wave Overnight Energy: Trump to revoke California's tailpipe waiver | Democrats propose bill to revoke Trump endangered species rollback | Trump officials finalize rule allowing fewer inspectors at pork plants Mark Mellman: The most important moment in history? MORE in the 2016 election.

Democrats are playing in a large swath of those seats, which are more than enough to target in their battle to take back the House this fall. Many of those seats are also in suburbs outside of a bigger city, particularly in the Midwest and Rust Belt. They’ll have to continue playing heavily in those types of districts if they want a shot at taking back the House.

Trump's impact on election remains uncertain

Trump was quick to claim credit for Balderson's too-close-to-call victory on Tuesday after appearing at a last-minute campaign rally. Though his visits can boost the Republican base, it remains to be seen how helpful — or hurtful — they can be in attracting more moderate and suburban voters.

Furthermore, Trump also has shown a willingness to back more extreme candidates than even his fellow Republicans had been hoping for, raising concerns about their prospects in the fall.

Trump appeared to do well in Michigan, where military veteran John James, whom Trump effusively endorsed, prevailed over his GOP primary opponent in a Senate race. James offers a compelling story as a black Republican candidate running for a body that counts Tim ScottTimothy (Tim) Eugene ScottTo boost minority serving institutions, bipartisan Future Act needs immediate action Cruz to oppose Trump appeals court pick The Hill's Morning Report — The wall problem confronting Dems and the latest on Dorian MORE (R-S.C.) as its sole black GOP senator.

But Trump also endorsed Secretary of State Kris Kobach, a conservative firebrand, over incumbent Gov. Jeff Colyer in Kansas's gubernatorial primary. The race remained too close to call. But if Kobach prevails, he could face tough odds in the general election, even in red-state Kansas.

But Sanders's and Ocasio-Cortez’s influence is also unclear

Sanders's and Ocasio-Cortez’s forays into the primaries were greeted with much fanfare.

But in Michigan, their choice for governor, Democrat Abdul El-Sayed, ultimately fell to Gretchen Whitmer (D), a former Democratic leader in the state Senate. Likewise, the Ocasio-Cortez-backed Democrat in Missouri’s 1st District, Cori Bush, failed to edge out longtime incumbent Lacy ClayWilliam (Lacy) Lacy ClayHouse Democrats blur lines on support for impeachment Appetite for Democratic term limits fizzling out Young Democrats look to replicate Ocasio-Cortez's primary path MORE in his primary.

Sanders and Ocasio-Cortez, the 28-year-old democratic socialist who beat out Rep. Joseph Crowley (D-N.Y.) in her House primary in June, have become standard-bearers for the progressive movement — and Democrats have been eyeing what kind of impact they will have in primaries this year.

Questions also linger beyond the primaries, given doubts about whether their message will resonate with voters in more rural and suburban parts of the country, particularly in the Midwest.

Another candidate backed by the duo in Democratic House primary for Kansas’s 3rd District, Brent Welder, slightly led challenger Sharice Davids early on Wednesday, though the race was far from being called.

But both Davids and Welder campaigned as progressives, posing a key test of whether policies such as "Medicare for all" can win over Kansas voters in a tough race against incumbent Rep. Kevin YoderKevin Wayne YoderK Street giants scoop up coveted ex-lawmakers Kansas Senate race splits wide open without Pompeo Mike Pompeo to speak at Missouri-Kansas Forum amid Senate bid speculation MORE (R) in the fall.

Another strong night for women

The “Year of the Woman” theme continued on Tuesday as more female candidates notched primary victories in crowded contests. That was particularly true in Michigan in races up and down the ballot.

Whitmer roared to victory in Michigan’s gubernatorial primary. Whitmer, who held a substantial financial edge, defeated two male opponents who sought to run to the left of her.

In two competitive House seats in Michigan, Democrats Gretchen Driskell and Elissa Slotkin cruised to victory in their races. Both are considered top recruits by national Democrats as they go on to face GOP Reps. Tim WalbergTimothy (Tim) Lee WalbergPro-trade group targets Democratic leadership in push for new NAFTA The Hill's Morning Report - Presented by Pass USMCA Coalition - Restrictive state abortion laws ignite fiery 2020 debate On The Money: Mnuchin signals officials won't release Trump tax returns | Trump to hold off on auto tariffs | WH nears deal with Mexico, Canada on metal tariffs | GOP fears trade war fallout for farmers | Warren, regulator spar over Wells Fargo MORE and Mike Bishop, respectively.

While the race is too close to call in both primaries for retiring Rep. David Trott’s (R-Mich.) seat, the Democratic and Republican nominees are likely to both be women.

With 86 percent of precincts reporting, Republican Lena Epstein, a staffer on Trump’s Michigan campaign, was ahead of her closest competitor by 6 points. And on the Democratic side, Haley Stevens, who was endorsed by Clinton, holds a small lead.

And in the race to replace former Rep. John ConyersJohn James ConyersEXCLUSIVE: Trump on reparations: 'I don't see it happening' McConnell: Reparations aren't 'a good idea' This week: Democrats move funding bills as caps deal remains elusive MORE Jr. (D-Mich.), former state Rep. Rashida Tlaib (D) secured the nomination in a heavily Democratic seat. That means she’ll likely become the first Muslim woman elected to Congress.

And in Washington state, women also look poised for victories in two top House races.