DES MOINES - President Barack Obama is asking Iowa voters to help him finish what they started in the state four years ago.
In his last political rally as a candidate, Obama said Iowa voters helped start "a movement that spread across the country."
More than 20,000 people are attended the outdoor rally on the eve of Election Day.
President Barack Obama and first lady Michelle Obama wave to supporters during the end of the final 2012 campaign event in downtown Des Moines Monday.
For the president, the Iowa rally is steeped with nostalgia. His win in the state's 2008 caucus jumpstarted his first presidential bid. And his last rally Monday night is being held in front of the building that housed his campaign headquarters during that election.
But it was more than just nostalgia that is bringing Obama back to Iowa one more time. The president's team is seeking to hold off Republican challenger Mitt Romney by sweeping the Midwest, including Iowa's relatively small prize of six Electoral College votes.
Obama was joined by his wife, Michelle, rocker Bruce Springsteen and a cadre of longtime advisers and friends who have been with him for the final stretch of his final campaign.
"I think tonight is going to be a fairly profoundly emotional night, to be there where it all started and nobody really saw how we could put it all together," said David Plouffe, Obama's senior adviser.
Obama's 2008 win in Iowa has taken on almost mythical proportions among aides who spent months here with the then-unknown U.S. senator from Illinois, urging voters in the largely white state to put a black man on the path to the presidency.
They recalled on Monday how much has changed since then, reminiscing about the president calling to introduce himself to everyone from Iowa's church leaders to high school students.
Obama campaign strategist David Axelrod said Obama, after having been told by one young woman that she was in yearbook class and needed the candidate to call her back, told his aides: 'You know, running for president can be a humbling experience," Axelrod said.
Axelrod and Plouffe wore matching "Obama '08" fleece pullovers Monday. Two other fixtures from the 2008 campaign also made special appearances: Robert Gibbs, a longtime Obama aide who was Obama's first White House press secretary, and Reggie Love, Obama's former personal assistant.
"It's like the end of a long-running series and all the characters are coming back to be here," Axelrod said. He and Plouffe spoke to reporters during Obama's first rally earlier in the day in Madison, Wis.
Obama's team is projecting confidence, but the outcome of Tuesday's election is far from certain. Polls show Obama and Romney locked in a tight race nationally, though the president appears to have an edge in key battleground states.
Iowa plays a key role in the campaign's Midwestern firewall strategy. Victories in Iowa, Wisconsin and Ohio would put Obama over the required 270 Electoral College votes.
Not surprisingly, Obama also stopped Monday in Wisconsin and Ohio.
While their focus was clearly on the Midwest heading into Election Day, the president's team insisted he was poised for a sweeping victory.
"I don't want to put a precise number on it, but I think we have a good chance to break 300," Axelrod said in an interview with CBS Radio.