Democrat Hillary Clinton and Republican Donald Trump have crisscrossed the United States, racing to sway undecided voters and to get their supporters to vote in a tight presidential contest that opinion polls show narrowly favouring Mrs Clinton.
With only one day left before election day, the Clinton campaign was boosted by yesterday's unexpected announcement by FBI Director James Comey that the agency stood by its July decision not to press any criminal charges in an investigation of Mrs Clinton's email practices.
The latest opinion polls showed the former secretary of state ahead.
A Fox News poll showed her leading Mr Trump by 4 percentage points among likely voters. Mrs Clinton also held a 4-point lead in an ABC/Washington Post poll and a CBS news poll.
Financial markets brightened this morning in reaction to the latest twists in what has been a roller-coaster presidential campaign.
Global equity markets surged, as did the US dollar, putting them on track for their biggest gains in weeks as investors saw yesterday's announcement by Mr Comey as boosting Mrs Clinton's chances of winning.
Both Mrs Clinton, 69, and Mr Trump, 70, are spending the day racing across a handful of battleground states that could swing the election, given the Electoral College system that awards the White House on the basis of state-by-state wins.
Mr Trump, who had never previously run for public office, held his first campaign appearance of the day in Sarasota, Florida, where he and Mrs Clinton have been locked in a tough battle in a state with a large Hispanic-American voting population.
Mr Trump gave no ground to Mrs Clinton or to polls showing her with a narrow lead.
Predicting he would win, he told supporters in Sarasota that Mrs Clinton "is such a phony" and, "We're tired of being led by stupid people."
Mr Trump also had stops planned in North Carolina, Pennsylvania, New Hampshire and Michigan, closing with a late-night rally in Grand Rapids, Michigan.
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Full coverage of US Election 2016
The FBI's Comey sent shockwaves through the race when he told Congress investigators had reviewed recently discovered emails and found no reason to change their July finding that there was no criminal wrongdoing in Mrs Clinton's use of a private email server, rather than a government system, while she was secretary of state from 2009-2013.
It was uncertain whether the announcement came in time to change voters' minds or undo any damage from days of Republican attacks on Mrs Clinton as corrupt.
Tens of millions of Americans had cast early votes in the ten days since Mr Comey first told Congress of the newly discovered emails.
"Nothing's going to change between today and tomorrow to help (Clinton) win back" undecided voters, Mr Trump campaign manager Kellyanne Conway said on ABC's Good Morning America programme.
Mr Trump, who drew wide criticism last month when he said the election was rigged against him and that he would not yet commit to respecting the outcome, questioned the thoroughness of the FBI review and said the issue would not go away.
Mrs Clinton was to make two stops in Pennsylvania and visit Michigan today before wrapping up with a midnight rally in Raleigh, North Carolina.
She was to appear at an evening rally at Philadelphia's Independence Hall with President Barack Obama and first lady Michelle Obama, as well as rock star Bruce Springsteen.
Speaking briefly to reporters before boarding her campaign plane in Pittsburgh, Mrs Clinton pressed her commitment to bringing the country together.
"I think that these splits, these divides that have been not only exposed but exacerbated by the campaign on the other side are ones that we really do have to ... bring the country together," Mrs Clinton said.
