But Meek wasn't able to garner the kind of support from independents and African Americans that Democrats had hoped, giving Rubio and Crist comfortable leads over the Democrat.
The former president is on a whirlwind campaign tour the next few days to help fledgling Democrats, but he won't be making any stops in Florida.
Obama recorded a radio ad for Meek earlier this month, although he last campaigned for the candidate in person in August.
The controversy brings a new headache for Democrats facing tough races and a dim prospect of losing the House and a considerable number of Senate seats next week.
The discussion is "tinged with a lot of suggestions about race and so that's kind of a problem for Democrats right now," said Jennifer Duffy, a political analyst at the Cook Report. "The other thing that makes it unusual and thus a little controversial is that it's not like they were asking him to step aside for another Democrat. They were asking him to step aside for a guy who a year ago was a Republican. That complicates things a little bit."
Meek is standing his ground and doesn't plan on dropping out of the race.
"Charlie Crist is a Republican. And he became an Independent, and he is against comprehensive health care reform, he is against a woman's right to choose. He is for offshore oil drilling," Meek said on "Good Morning America" today. "I don't see myself handing anything to anybody. It is not my prerogative to do that."