"I did not know the phrase I used in Miami today was associated with Che Guevara & I did not mean to offend anyone who heard it that way," de Blasio tweeted.
Thursday's debate will feature Pete Buttigieg, Biden and Sanders as well as wild cards Andrew Yang and Marianne Williamson.
"A win for me would be that millions of Americans get a sense of me and my message and check out my campaign afterwards," Yang said.
Speaking as a professional debate educator, I wouldn't say the lessons of persuasive public speaking, critical thinking and respect for civil discourse were the candidates' top priority in Miami. More like survival.
More than ever before, voters are demanding action on this crisis.
"I'll be honest, I really do think that this was a breakaway night," she said in her appearance on "The Late Show."
President Donald Trump let rip at NBC on Twitter after audio problems during its first 2020 Democratic Party debate.
Senator Cory Booker and Julián Castro dominated the conversation both on the debate stage and online.
Four of the candidates on stage said China posed the most danger to the U.S. and another four identified climate change as the biggest threat.
"What that means is not just a woman, but let's not forget someone in the trans community, a trans female, is poor doesn't mean they shouldn't have the right to choose," Castro said during Wednesday's first 2020 Democratic debate.
Castro also called on other Democratic candidates to promise to change the current immigration system.
Senator Amy Klobuchar shut down Governor Jay Inslee's claim that he was the "only candidate" who "has actually advanced the ball" on abortion rights.
While oddsmakers have generally followed the polls, there is one notable outlier.
Wednesday evening marks the first of twelve 2020 Democratic primary debates, a time for candidates who are vying for the top of the polls to push ahead and for those struggling with name recognition to make themselves known.
I have no doubt that a woman can be our next president, and no candidate will fight harder for the American people than my home state Senator Elizabeth Warren.
Sanders pushed back against NBC News host Kasie Hunt, who repeatedly asked if he'd concede the Democratic primary if it's clear he is going to lose.
Senator Elizabeth Warren will be center stage as 10 contenders for the 2020 Democratic presidential nomination face off in Miami Wednesday.
Elizabeth Warren's tax plan is estimated to bring in $2.75 trillion in revenue over a ten-year period. which could help pay for universal child care, tuition-free college and student loan forgiveness.
Democrats feel most strongly about discussing issues related to climate change, gun policy and abortion access, not necessarily the president.
Lara Trump isn't the first person in Donald Trump's orbit to use the refrain.
Women are again poised to be the determining factor in the election and ready for candidates to show how they would support us as president.
Recent years' gains for working people have their roots in progressive advocacy, not Trump policies. Democratic presidential candidates should be sure to point this out in the debates.
"It could be that President Obama knows something because there is something going on in that brain of his," Trump said.
For many in Generation Z, 2020 will be the first year they're eligible to cast a ballot for president.
"But wait, what about car loans? Let's pay those off, give everybody a free car," Huckabee said sarcastically.
The chorus marked a subtle shift in what has been a remarkably collegial race between the Democratic hopefuls, who have mostly avoided criticizing one another and focused their ire on Trump.
"You've got a president who tried to throw 32 million people off health care. He ain't gonna run on that one," said Sanders.
The former vice president and 2020 Democratic candidate struggled to explain how he would protect abortion access during a Planned Parenthood event Saturday.
"Biden's past statements and positions on race issues present a serious challenge to his candidacy for the Democratic presidential nomination according to our polling," said McIntosh.
Impeachment continues to be a thorny topic for Democrats. For the most part, leaders of the party have argued that impeachment is a politically risky move.