TAMPA, Fla. —
Obama then spoke to about 8,500 people at a morning rally in Tampa, a swing area of battleground state Florida.
With a full day of campaigning still ahead of him, Obama's voice was already hoarse. But he told the enthusiastic crowd he was "just going to keep on keeping on until every single person out there who needs to vote is going to go vote."
He noted to cheers that he was going to Chicago later Thursday to participate in early voting and that first lady Michelle Obama already mailed in her ballot.
Obama's campaign also announced joint rallies Monday with Bill Clinton in Orlando, Fla., Youngstown, Ohio, and Prince William County, Va. The president also picked up an endorsement from former Secretary of State Colin Powell, a Republican who supported Obama in 2008. Powell praised Obama's handling of the economic recovery, telling "CBS This Morning," ''I think we've begun to come out of the dive and we're gaining altitude."