But in both chambers, the sheer number of airtight toss-up races means there are no guarantees about tonight's outcome, even as generic congressional ballots show Democrats with the advantage over Republicans and the party of the president historically loses seats in their first midterm elections.
With some races still undecided, Democrats appeared headed to a gain of more than 30 seats, well beyond the 23 they needed to claim their first majority in the 435-member House in eight years.
Though liberal voters across the country are fired up after the first two years of Republican control, it's far from guaranteed that they will turn up in great enough numbers to deliver the House and Senate back to Democrats.
Rep. Mia Love, who was the sole black Republican woman in Congress, was trailing in Utah to Democrat Ben McAdams. The supermajority enables Republicans to override vetoes issued by Democratic Gov. Roy Cooper.
Democrat Sen. Bob Menendez won a third Senate term in New Jersey, despite a federal bribery indictment that prosecutors dropped this year after a mistrial. That has put Democrats on the defensive in Indiana, Missouri, Montana and North Dakota, and it has made winning Senate control an uphill struggle. Gillum conceded to Republican Ron DeSantis, a Trump ally.
"It's a very good turnout", said William Harkins, chief election officer at a polling station in Arlington, Virginia. "I think the public will repudiate him [Trump] by voting in a Democratic-controlled House of Representative, because they do want a check".
Sanders, the independent who has always been one of the state's most popular politicians, spent little time campaigning ahead of Tuesday's election.
"Congressman Peter King of NY is a hardworking gem".
Trump has also sought to temper expectations in recent days that Republicans would hold the House, saying he was more focused on campaigning for Senate races.
Outside Richmond, Virginia, one-time tea party favorite Rep. Dave Brat faced an unusually strong challenge from Democrat Abigail Spanberger, a former Central Intelligence Agency operative motivated to run for office after the GOP vote to gut the Affordable Care Act.
Voters "rejected the politics of hate, the politics of division and the politics of ideology", Spanberger told supporters Tuesday night.
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But with his party losing its majority in the House, the results represented a bitter setback for Trump after a campaign that became a referendum on his leadership. He was defeated by Democrat Debbie Mucarsel-Powell. Thing is, there are about 75 seats that are up for grabs, meaning they're super competitive, as per race ratings from the Cook Political Report.
A fight over funding for the President's signature campaign trail promise of a wall along the US-Mexico border looms large when lawmakers return to Washington after the midterms and along with it, the threat of a partial government shutdown.
"This was a hard campaign", Curbelo told reporters in Miami. Nevada could be more important, because Dean Heller is the most vulnerable Senate GOP incumbent in the nation, and Democrats probably need to win his seat to seize the majority.
Opposition to Trump proved to be more a motivating factor for Democrats than support for the president a factor for Republicans. She finished about 3 percentage points behind the incumbent in a Lexington-area district Trump won by 15 percentage points in 2016.
Most top House races are set in America's suburbs where more educated and affluent voters in both parties have soured on Trump's presidency, despite the strength of the national economy.
Long lines and malfunctioning machines marred the first hours of voting in some precincts, including in Georgia, where some voters reported waiting up to three hours to vote in a hotly contested gubernatorial election.
Examining just the midterm elections after 1980, the picture is equally mixed.
Midterm elections are the chance for voters to choose their candidates for the US Congress, governorships and local elections. That could help Democrats because younger voters tend to lean their way.
However, Goodstein believes that the relative silence over the alleged links between Trump's 2016 campaign and Russian Federation will be broken again as soon as the Democrats take over the House. He was active on Twitter throughout much of the day, blasting out endorsements for Republican candidates and weighing in on the balloting.
An IPSO poll conducted ahead of the mid-terms found "investigating and potentially impeaching" Trump was the number one priority for Democratic voters. Under President Trump, over 4 million new jobs have been created, unemployment is the lowest it has been since 1969, wages have increased, taxes have decreased, unneeded regulations have been slashed, the median household income is up to a post-recession high of over $61,000, consumer confidence is at an 18-year high, over $450 billion dollars has been poured into the United States and the economy is on pace to grow at over 3 percent in 2018 for the first time since 2005.