Voting has already wrapped up in parts of Kentucky, where the White House is watching incumbent three-term Republican Rep. Andy Barr's effort to hold his seat a state Trump won by 16 points in 2016 as a potential barometer of how the night will go.
A surge in early voting, fuelled by a focus on Trump's pugilistic, norms-breaking presidency by supporters of both parties, could signal the highest turnout in 50 years for a midterm US election, when the White House is not on the line.
The party of a first-term president tends to lose congressional seats in off-year elections.
All 435 seats in the US House of Representatives, 35 US Senate seats and 36 governorships are up for grabs in elections focused on dozens of competitive races from coast to coast that opinion polls show could go either way.
In the last 24 years, Democrats have only controlled the House of Representatives for four years. However, the truly interesting races will be in the so-called upper chamber of Congress, the Senate.
There are a few races that look to be especially captivating. There are now 236 Republicans, 193 Democrats, and six vacancies. However, Texas is a big prize simply because it is the second-largest state in the country.
Trump spent his final hours on the trail Monday in Ohio, Indiana and Missouri, where his rhetoric on illegal immigration turned harsh and he lobbed attacks at Democrats. However, Cruz is a very effective orator and debater and has received the unconditional support of Trump.
For decades, news organizations' exit polls have been conducted by Edison Research for the National Election Pool, a partnership of ABC, CBS, CNN, Fox, NBC and The Associated Press. Republicans, meanwhile, kept control of the Senate.
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But a US Department of Homeland Security official said the reports of voting technology failures appeared so far to have had no significant impact people's ability to vote. "You vote, you might save a life". Nelson also served as an astronaut in 1986 through a special NASA program developed to take a congressman into space (it was similar to the program seven months earlier that saw Prince Sultan bin Salman join NASA on a shuttle mission). Scott faced scandals during his business career, while Nelson is a career politician, which is viewed as noxious by many Americans. However, more women than ever before won major party primaries for Congress and governor this year, giving women the chance to significantly increase their numbers in office.
Winning control of the Senate is a much tougher ask. Floridians who do not like Trump will certainly vote for Nelson. The last batch of states will close their polls at 1 a.m. EST on Wednesday night. With the first polls not slated to close until 6 P.M. eastern, polling was the only indicators both parties had on Tuesday of their prospects.
Democratic Senate candidates are in danger of losing their seats in Missouri, North Dakota and Indiana.
Nassau Democratic Committee Chairman Jay Jacobs says at least 10 Republican incumbents are vulnerable statewide. What was not normal was that Menendez had been indicted on corruption charges and escaped with hung jury. Menendez is being challenged by Republican businessman Bob Hugin, 64. The indications are that Menendez will win but, if Hugin succeeds, it would be a bad sign for Democrats.
Under the United States constitution a president can be removed from office "for, and conviction of, treason, bribery, or other high crimes or misdemeanours".
Mr Trump also could face more pushback from Democrats on trade tariffs he has introduced, particularly in farm states hard hit by retaliatory measures from China or manufacturing states hit by higher steel and aluminium prices. The president has been ever-present in news coverage, holding numerous impromptu press sessions and formal interviews and criss-crossing the U.S., sometimes appearing at multiple rallies in the same day.
Georgians were picking their next governor following a tight, bitter race in the southern state. It appears to have been an effective strategy in places like in and Tennessee, an open Republican-held seat where Republican Marsha Blackburn staved off what could have been a serious challenge by former Governor Bredesen.