There is a lot up for grabs Tuesday.
The first time was during the Great Depression in 1934, when Democrats gained nine House and 10 Senate seats under President Roosevelt.
In the Senate, 35 seats are at stake, with Republicans positioned to hold - and possibly expand - the party's slim majority.
That doesn't count the 6,066 state legislative races across 46 states and 158 ballot measures in 37 states.
Faced with the possibility of keeping the Senate but losing the House, aides in recent days had laid out the political reality to Trump, who could face an onslaught of Democratic-run investigations. Shalala will replace retiring Republican Ileana Ros-Lehtinen.
Virginia's 7th District: Tea Party vs.
In Virginia, political newcomer Jennifer Wexton defeated two-term GOP Rep. Barbara Comstock.
Outside Richmond, 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.
But those are the swing districts.
In southern Oregon, Democrat Jeff Golden, a river guide and public television production manager, edged Republican Jessica Gomez to take Republican Sen.
The earliest results in the nation will come in from in and Eastern Kentucky. Despite those moves, Lance might not be able to escape the shadow cast by Trump and the GOP agenda.
California's 45th District: Welcome to the O.C.. Seven seats are now vacant.
"They refused to let anyone shut them up or stand in their way, and that is how real change begins", she added. Mitt Romney won the district by 12 points, but it went for Clinton by five. Elizabeth Warren in MA, according to CNN projections. A victory here by Porter, a progressive favorite who has endorsed single-payer health care, would send a signal of how far the politics of this area have moved.
Around a dozen races from New Jersey to Nevada were seen as coin flips or at least competitive, prompting each side to spend hundreds of millions of dollars. Still, Republican voters tended to be overwhelmingly supportive of the president.
White House spokeswoman Sarah Huckabee Sanders says a Democratic wave may look more like a "ripple".
AP reports that Democrats have won half of the seats they need to claim House majority; GOP picking up key Senate contests. Following President Obama's first term, 63 House seats and six Senate seats were lost by the Democrats.
In North Carolina, Republicans were struggling to hold onto a seat where Baptist minister Mark Harris ousted a GOP incumbent in the primary. But some of the biggest delays at voting booths were also in Georgia. Then Trump entered the picture. On Monday, he blitzed through a trio of Midwest states he won in 2016 - Ohio, Indiana and Missouri - exhorting his supporters to help send Republicans to Capitol Hill to help safeguard his administration's accomplishments and a booming economy.
After their victory, House Democrats are expected to try to harden USA policy toward Saudi Arabia, Russia and North Korea, while maintaining the status quo on hot-button areas like China and Iran. Now she faces a challenge from gun control activist Lucy McBath, whose son was shot and killed in 2012 after a dispute over loud music. It was a deliberate strategy to expand the playing field to about 80 districts, stretching beyond college-educated voters in the suburbs into regions where the party has seen its fortunes fade. The Democrats also made inroads in Trump country, where they tried to win back white working-class voters.
The Democrats' path to the Senate was increasingly narrow, however. Claire McCaskill is unable to hold on in Missouri. Dean Heller's shifting stances on the repeal of the Affordable Care Act.
Andrew Gillum, who is running for the office of Governor of Florida, has also gone viral during the campaign, after he responded to the idea that his opponent Ron DeSantis is a racist by saying: "A hit dog will holler".
An IPSO poll conducted ahead of the mid-terms found "investigating and potentially impeaching" Trump was the number one priority for Democratic voters. For Democrats such as Rosen who are in razor-thin races, the potency of the health care argument could be crucial to their chances.
16 women nominated for Governor (of the 36 states electing one today).
A record number of women were elected to the House on Tuesday, almost two years after women spilled out into the streets of Washington and in cities across the country in defiance of the inauguration of President Donald Trump. That's reason enough to keep a close eye on this race.