The best we can do is look at the polls - and at this stage the most likely outcome seems to be that the Democrats will take the House of Representatives, with the Republicans maintaining control of the Senate. Republicans also managed to hold on to two contested Senate races. It will also determine whether Senate Democrats can launch investigations into controversies that have surrounded Trump while he has been in office and before he was elected, including allegations surrounding obstruction of justice, Trump's finances and potential Russian collusion.
While Donald Trump is not on the ballot, the consequences for his presidency could be dramatic.
"So, something is happening", Trump told reporters on Monday, shrugging off suggestions that Democrats had the momentum. And in Tennessee, Congresswoman Marsha Blackburn defeated former Gov. Phil Bredesen, a top Democratic recruit. "That is particularly true when a president is unpopular, as this president is".
The battle for Georgia governor intensified in its final hours as Abrams, the Democrat, and Republican Brian Kemp framed the race as a stark choice for the state and prepared for another month of campaigning if no one wins a majority.
A Democrat-controlled House was expected to pursue anti-corruption and voter-rights legislation, and hold multiple investigations on controversial aspects of the Trump administration, not least being allegations of collusion between his 2016 campaign and Russian Federation.
"I want to focus on good planning and processes to keep Wake County a good place to live, work and raise children", she said.
"Things are pretty good, yet we have all this division and we have this president who's relatively unpopular, so we have this unusual juxtaposition", said Kent State politics professor Michael Ensley, citing Trump's poor approval ratings despite a rollicking USA economy and the absence of any major foreign-policy challenges.
For nearly two years, Trump's rule-breaking, sometimes chaotic administration has enjoyed a largely free hand from the twin Republican-controlled chambers, but the midterms could finally see his wings clipped.
He bet big on a xenophobic closing message, warning of an immigrant "invasion" that promised to spread violent crime and drugs across the nation. That was during Republican President Ronald Reagan's first term, when turnout among Democrats rose at twice the rate of increase among Republicans, according to Pew Research Center, resulting in a net gain of 26 seats for Democrats in the House.
Democrats need to gain 23 seats in order to regain the majority in the lower chamber, a position of power they haven't been in since 2010. Menendez won in the heavily Democratic state despite a federal bribery indictment that prosecutors dropped this year after a mistrial.
District 4: Former Democratic school board member Susan Evans received 61.82 percent of the vote against Republican challenger Kim Coley, who had 38.47 percent.
"Democrats want to invite caravan after caravan of illegal aliens to pour into our country".
In suburban Virginia, Democrat Jennifer Wexton ousted incumbent Republican Barbara Comstock, while another Democrat, Donna Shalala, seized a Republican district in Florida.
Dead, 5 Injured in Florida Yoga Studio Shooting
The shooting Friday was in a small Tallahassee shopping center and multiple police cars and ambulances were on the scene. Other outrages in his life included women who gave him their phone numbers and later told him they had boyfriends.
Trump's racially tinged anti-immigrant appeals could hurt Republican candidates in swing states like Arizona and Nevada where college-educated voters could be decisive, but his rhetoric could help in deeply conservative areas.
Voters will "define the future, not just of Texas, but of this country, not just of this generation but every generation that follows", said Democrat Beto O'Rourke, who is challenging Senator Ted Cruz in traditionally deep-Republican Texas.
All 435 seats in the U.S. House were up for re-election, although fewer than 90 were considered competitive.
There are 35 Senate races being decided across 33 states.
In other results, Vermont independent Sen.
Kentucky, meanwhile, will give us an early indication of how the US House races are shaping up.
He and the first lady were to host an evening watch party for family and friends.
Vice President Mike Pence congratulated his brother for serving in the US Congress.
The political and practical stakes were sky-high. Perhaps more important, they would claim subpoena power to investigate Trump's personal and professional shortcomings.
Some Democrats have vowed to force the release of his tax returns.
Democratic Sen. Joe Manchin was re-elected in West Virginia, a state Trump captured by 42 percentage points in his 2016 election triumph.
The demographic divides were coloring the political landscape in different ways.
But when it came to candidates for state Senate, Democratic primary voters threw their weight behind progressive candidates, including 27-year-old democratic socialist Julia Salazar - who actively campaigned on issues like sex workers' rights and racial injustice - and Alessandra Biaggi, another millennial and first-time candidate. Mr Trump is fighting hard for this seat and chose Missouri as the location for his final campaign rally.
History was working against the president in the Senate: 2002 was the only midterm election in the past three decades when the party holding the White House gained Senate seats.
Democrats boast record diversity on the ballot. Democrat Andrew Gillum is hoping to become the state's first African American governor. Both Barack Obama and Bill Clinton's numbers were 5 points higher at the same period, and both suffered catastrophic midterm losses of 63 and 54 House seats respectively.