As to the Senate, Republicans have a much better chance of keeping control. McAdams believes that Republicans and Democrats are effectively the same.
Texas candidates Beto O'Rourke and Ted Cruz (top), and Missouri candidates Claire McCaskill and Josh Hawley (bottom) are in two of many very close Senate races that will be resolved as votes roll in. Marsha Blackburn triumphed in Tennessee.
"Most of the candidates that the president actually went in and campaigned for and who embrace the president are doing well tonight", she said. Bill Nelson was trailing his challenger, current Republican Gov. Rick Scott, with most of the vote in. He was defeated by Democrat Debbie Mucarsel-Powell.
The GOP campaign committee distanced itself from eight-term Rep. Steve King of Iowa after racial remarks, and his seat was unexpectedly contested in the final week of the campaign. They were heavy favorites in their races.
Sanders, the independent who has always been one of the state's most popular politicians, spent little time campaigning ahead of Tuesday's election.
Trump embarked on a bruising schedule of rallies over the past few weeks to drive his supporters to the polls.
Many Democrats, already benefiting from anti-Trump enthusiasm, focused on bread-and-butter issues like maintaining health insurance protections for people with pre-existing medical conditions and safeguarding the Social Security retirement and Medicare healthcare programmes for senior citizens.
"They could be tempted to say that the public wants an impeachment process based on uncertain claims, but I don't think the public wants that", the professor at University of Toronto said. Republicans are expected to keep their majority in the Senate and forecast to gain one seat in the upper chamber. At least three other red districts flipped to blue.
Republicans are expected to retain their slight majority in the U.S. Senate, now at two seats, which would let them retain the power to approve U.S. Supreme Court and other judicial nominations.
But the election remained likely to serve as a referendum on Trump's racially charged appeals and the strength of the coalition that powered him to the White House - a group he will need again in just two years.
The White House at dusk on election day. In Utah, former GOP presidential candidate Mitt Romey is a shoo-in to win the Senate seat vacated by GOP Senator Orrin Hatch; there is no Senate race in Oklahoma, and in New Mexico, incumbent Democratic Senator Martin Heinrich is running for reelection against Republican nominee Mick Rich, a businessman, and Libertarian nominee Gary Johnson, who served twice as GOP Governor of the state.
Democratic Sen. Joe Manchin was re-elected in West Virginia, which Trump captured by 42 percentage points. The winners included Democrat Mikie Sherrill, a former Navy pilot and federal prosecutor who ran for a suburban Newark seat. The GOP's grip on high-profile governorships in Georgia and Wisconsin were at risk as well. More than two-thirds rate the economy as good, compared to 36 percent only two years ago.
Trump also touted a booming US economy that continues to pump out jobs and raise average wages But his economic arguments were overshadowed by those appealing to nativist sentiments, such as a promise to end the right of anyone born in the States to citizenship.
"The 'resistance, ' they call it", Richard Milner, 66, a boat inspector from Norfolk, Virginia, said of Trump's opponents.
"We've got to get down to work as soon as we are sworn in on January 3 and make some real change come about. we're going to have a lot of brand new members - many of whom will come from tough districts, many of them that never served in any elected office in their higher lives".
Wrapping up the campaign in recent days, Trump repeatedly raised fears about immigrants, issuing harsh warnings about a caravan of Central American migrants that is moving slowly through Mexico toward the USA border.
An investigation into whether Supreme Court Justice Brett Kavanaugh lied under oath to get confirmed could also be launched, he said. First-term Democratic Rep. Jacky Rosen ousted him, attacking him for backing last year's Republican effort to repeal President Barack Obama's health care law. Jeff Flake of Arizona and Tennessee's Bob Corker, both leaving Congress after accusing Trump of dishonesty and questioning his competence. The last time a Dem won a seat in the senate in Texas was in the 1980s.
Ballot counting could drag in tight races, leaving some races undecided long after Election Day.
Four GOP seats in Orange County, including two where the incumbent Republicans retired, were in play, along with three other seats to the north beyond Los Angeles and into the Central Valley. She is not running as a progressive firebrand, but just as Brat rode the Tea Party wave against Cantor, Spanberger could capitalize on the suburban backlash to the President in a traditionally Republican district.
AP reporter Ben Finley in Norfolk, Virginia, contributed.
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