Polls close in Michigan, Kansas, and Missouri at 8 PM ET and polls will close in Washington at 11 PM ET.
"I'm just exhausted of the rhetoric of 'They're the bad guys, we're the good guys, "' said Moffitt, 29.
A Monmouth poll last week showed the race was essentially a dead heat, down from a double-digit advantage for Balderson a month ago.
Maloney said that type of endorsement and Trump's brand of politics is damaging the Republican party.
On stage with Trump, Balderson called himself "someone who will fight for President Trump's economic agenda".
Democrats, meanwhile, have been attacking Balderson by casting his support of tax cuts as threats to Social Security and Medicare.
The pro-Balderson effort has focused largely on motivating Republican voters by casting O'Connor as extreme.
Democratic challenger Danny O'Connor is critical of both Republicans and Democrats. His campaign spent $2.25 million on advertising compared to Balderson's $507,000, according to campaign tallies of ad spending. The Republican campaign arm and its allied super PAC were forced to pick up the slack, spending more than $4 million between them. The race could become further disrupted if Kansas City-area businessman Greg Orman makes it onto the November ballot.
Trump made his preference clear for Kobach.
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"He is a fantastic guy who loves his State and our Country - he will be a GREAT Governor and has my full & total Endorsement!"
The suburban Columbus district has been in Republican hands for nearly four decades and voted for President Trump by 11 points in 2016, so by all accounts the race shouldn't even be close.
Also in the race: Native American attorney Sharice Davids and former school teacher Tom Niermann.
And in Missouri's 1st District, Democratic Rep. William Lacy Clay faces a challenge from the left from Cori Bush, a nurse and activist who has campaigned with Ocasio-Cortez.
Voters in suburban Detroit were also weighing in on the direction of the Democratic Party.
"I think of Republicans lose this seat it will confirm that they are in a boatload of trouble come November and they should batten down the hatches because they will probably signal that a democratic wave is coming if not already there", said Bevan. The field includes Fayrouz Saad, who would be the first Muslim woman in Congress.
The 12th district has numerous hallmarks of areas that could be weak spots for Republicans this cycle - well-educated, relatively affluent suburbs that may have soured on Trump and are looking to register their frustration through their midterm vote.
In the MI governor's race, progressive favorite Abdul El-Sayed, the 33-year-old former Detroit health official vying to become the nation's first Muslim governor, faces former state Senate Democratic leader Gretchen Whitmer, who is considered the favorite in the race. He'd join Sen. Tim Scott as the only black Republican senators if he did.
The night before the rally, Trump took to Twitter to attack LeBron James, calling the National Basketball Association star dumb just days after James, an OH native, poured tens of millions of his own dollars into the opening of an innovative public school in Akron.