The defection comes as Republican presidential nominee Donald Trump again casts doubt on whether he will accept losing to Democrat Hillary Clinton.
The presidential candidates exchanged self-deprecating jokes and pointed barbs, mostly to the audience's delight.
The presidential candidate told reporters that she would not be taking naps following the third and final debate.
Trump has some ground to make up in a couple of key battleground states.
Watch Michelle Obama denounce Trump in Arizona Thursday.
The Republican nominee's refusal to accept the election results should he lose to Hillary Clinton is similar to some past foreign leaders.
Attorney Gloria Allred told reporters Virginia decided to go public with her story after a tape of Trump making profane comments in 2005 surfaced earlier this month.
Thanks to Trump’s nifty vernacular, there was a spike in searches for various terms he used during the debate.
Instant reaction polls after the third debate pointed to a win for Democratic nominee Hillary Clinton.
David Kittos has alleged that the campaign used his copyrighted image of a bowl of Skittles for an anti-refugee tweet.
Democrat Hillary Clinton called Trump's answer "horrifying."
Donald Trump embraced the in-your-face rhetoric that helped him sail through the GOP primary and keep his standings in the polls despite attacks from Republican leaders.
Everything you need to see from Donald Trump vs. Hillary Clinton in the third and final presidential debate.
The Republican presidential candidate said the people he would select to replace late Justice Antonin Scalia would protect the Constitution.
Trump, who has said in the past that women who have abortions should be punished, said Clinton’s policy views will mean more late-term abortions.
The candidates debated on the Supreme Court, foreign policy and the economy, among other things, at the University of Las Vegas, Nevada.
Chris Wallace will preside over Wednesday's presidential debate.
This is where you can watch the third presidential debate.
The Investor’s Business Daily/TechnoMetrica Market Intelligence was the most accurate poll in the 2004, 2008 and 2012 election cycles.
Despite recent setbacks to his campaign, bookmakers have been shortening Donald Trump’s odds to be president.
A political action committee made up of Muslim women is facing harassment after endorsing Hillary Clinton.
Green Party nominee Jill Stein will again be absent, again, as Hillary Clinton and Donald Trump square off in the final presidential debate.