Democrats could also recapture governor's offices in several battleground states such as Michigan, Wisconsin and OH, a potential help for the party in those states in the 2020 presidential race.
The results were hailed as a turning point by Democrats in elections billed as a verdict on the first two years of Mr Trump's divisive presidency but fell short of a "blue wave" of sweeping victories.
Republicans now hold 33 governorships and 65 legislative chambers, with Democrats controlling 31 and 2 being tied, according to the nonpartisan National Conference of State Legislatures (NCSL), which does not include Nebraska's nonpartisan, unicameral legislature in its count.
As to the Senate, Republicans have a much better chance of keeping control. If Bredesen wins, he'll be Tennessee's first Democrat Senator since Al Gore in the early 1990s. When the Cook Report classified Menendez's race as a toss-up recently, things got tense for Democrats over a race that under normal circumstances they would have won going away. Republican incumbent Andy Barr fended off a strong challenged from Democrat Amy McGrath, a Naval Academy graduate and the first female U.S. Marine to pilot an F/A-18 Hornet in combat, in Kentucky's 6th Congressional District. She finished about 3 percentage points behind the incumbent in a Lexington-area district Trump won by 15 percentage points in 2016.
In Virginia's 7th District, a Republican-leaning area near Richmond, Republican Representative Dave Brat was trailing Democrat Abigail Spanberger, a former Central Intelligence Agency officer.
"Thanks to you, tomorrow will be a new day in America", said House Democratic leader Nancy Pelosi (Calif.), who is poised to reclaim the speaker's gavel she lost eight years ago. While the Republican president is not on the ballot, the campaign has been indeed largely about him, with Democrats missing no opportunity to tear into the administration's immigration policies, branding the president racist and even comparing him to Osama bin Laden.
Donald Trump claimed "tremendous success" despite his party losing control of the House of Representatives in midterm elections last night after mixed results saw Republicans strengthen their grip on the Senate.
"We always knew these races are going to be close", said Rep. Katherine Clark of MA, co-chair of House Democrats' recruitment efforts. Republicans who rode their opposition to Obamacare to the House majority in 2010 were forced to backtrack in race after race, insisting that they actually did support such protections.
Almost 40 per cent of voters cast their ballots to express opposition to the president, according to AP VoteCast, a national survey of the electorate, while about 25 per cent said they voted to express support for Trump.
Aides set up televisions in the White House residence for Trump, first lady Melania Trump and their guests to watch election results come in, with the sets tuned to different cable news channels. "The President has energized a staggering number of Americans at packed arenas and in overflow crowds at rallies across the country", Sanders said.
Stephen Myrow, managing partner at Beacon Policy Advisors, discusses how the markets are poised to react to the USA midterm election results.
Problems with voting machines prevented Americans from casting ballots in a dozen states, U.S. rights advocates said, following complaints about registration problems, faulty equipment and intimidation they have received throughout early balloting. Do voters in Iowa and other spots on the Obama-Trump map swing back to the Democrats?
Political gridlock between the White House and Congress could hinder Trump's pro-business agenda and raise concerns about USA political instability, but investors may have already priced this in.
Investors often favour Washington gridlock because it preserves the status quo and reduces uncertainty, even though many investors this time around had been hoping for a continuation of the Republican agenda.
Democrats picked up the seats they need in large part by targeting suburban districts where Trump had grown increasingly unpopular, through a relentless focus on health care and other economic issues. Republicans who dominate the state would probably prevail, but waiting for the outcome could extend the uncertainty about the Senate's party breakdown - and perhaps which side has control. There are 35 seats up for election this year, and 26 are held by Democrats, meaning Democrats have a lot to defend.
They paved their path to victory by defeating Democrats Joe Donnelly of Indiana, Heidi Heitkamp of North Dakota and Missouri's Claire McCaskill. Like other Democrats across the country, Spanberger emphasized protecting people with pre-existing conditions from being denied coverage or charged more by insurers.
About 4 in 10 voters choose health care as the most important issue facing the country, and 7 in 10 say the nation's health care system needs major changes, the exit polling shows.
"Democrats are inviting caravan after caravan, illegal immigrants to flood into our country", he said at a rally on the election's eve Monday.
On the eve of the mid-term elections, Democrats continue to hold a double-digit lead over Republicans in a generic congressional ballot among likely voters, according to a new CNN Poll conducted by SSRS.
Democrats Joe Manchin in West Virginia and Tammy Baldwin in Wisconsin won their Senate re-election bids, both states Trump won in 2016.
"I think, like the TV stations have been saying, it's a referendum on the Trump presidency", said Eloisa Alvarez as she voted in Miami. He said since Trump has been president, he 's hired two more employees for his six-person company.