With voters going to the polls Tuesday, nothing is certain.
However, thunderstorms are forecast for Tuesday along the eastern coast, as well as snowstorms in the Midwest, which could affect turnout.
"If the radical Democrats take power they will take a wrecking ball to our economy and our future", Trump declared in Cleveland, using the same heated rhetoric that has defined much of his presidency. He added: "The Democrat agenda is a socialist nightmare".
Democrats need 23 pickups to win majority in the House; chief correspondent Jonathan Hunt reports from Seal Beach, California. "It's an awakening of the Democratic Party".
It is likely that there will be a good idea of how the election is turning out during the early hours of Wednesday morning, but the full set of results could take days or even weeks depending on if there are any complications.
With a characteristic mix of folksiness, bombast and sometimes cruel humour, he says voters must choose between his stewardship of a booming economy and what he claims would be the Democrats' extreme-left policies.
"It's up to voters whether they get the gavel".
Neil Sroka, the communications director for Democracy for America, a progressive political action committee, said: "In the era of Donald Trump, it's nearly impossible for anything not to be about Trump: people want a check on this administration".
Just five years ago, the Republican National Committee (RNC) reported that the party's very survival depends upon attracting more minorities and women.
Handel, elected in a special election past year, is facing headwinds from a gubernatorial contest that is energizing Democrats in her north Atlanta district.
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Also seeking re-election are John Sarbanes, the Democratic representative from Maryland's 3rd Congressional District, and Dina Titus, a Nevada Democrat that has represented the state's 1st Congressional District since 2013.
The two parties were also tangling in several crucial governors' races, including in Midwest battleground states such as Wisconsin, Ohio, Iowa and MI. "They've really become radicalised". "You see how they've behaved".
Facebook said it blocked 115 accounts for suspected "coordinated inauthentic behavior" linked to foreign groups attempting to interfere in Tuesday's US midterm elections. The demographic shifts also reflect each party's closing argument. Maybe back in '16 during the presidential, right around the vote. "Health care for millions of people".
"This first midterm, at this check-in moment, to have these different forces converge in different ways, to have the different loud landscape for the House and the Senate".
Supporters wait for the arrival of U.S. President Donald Trump for a campaign rally at the Allen County War Memorial Coliseum in Fort Wayne, Indiana on November 5, 2018.
Many Democratic candidates in tight races shied away from harsh criticism of Trump, focusing instead on bread-and-butter issues like maintaining insurance protections for people with pre-existing medical conditions and safeguarding the Social Security retirement and Medicare healthcare programs for senior citizens.
"I'm not pleased with Trump's leadership at all".
About three quarters of the 50 states in the east and center of the country were already voting as polls began opening at 6:00 am (1100 GMT) for the day-long ballot. Evangelical Christians are also a key constituency, seen to be happy with Mr Trump and Vice-President Mike Pence over their pro-life conservatism and the President's shifting of the US Embassy in Israel to Jerusalem. "I don't think Trump has done that at all". "That's why our economy is growing like it is".
Democrats need to pick up two dozen seats to claim the House majority.
What makes it even more hard for the Democrats is the majority of the seats in these states were overwhelmingly in favour of Trump in 2016. "She will be the Speaker of the House if the Democrats take control".
Republicans are favoured 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 on straight party-line votes.
Given Trump's stunning victory in 2016, few were confident in their predictions.
"I don't feel despair", she said.