But he had also enlisted an army of A-list performers and public figures — from Lady Gaga to Billie Jean King, from Jay-Z to Crosby, Stills and Nash — to promote his re-election via Twitter and Facebook.
The Obama campaign provided a who’s-who of 181 actors, musicians, authors, athletes, mayors, and more that fit any and all demographic groups in the president’s target zone. All were deployed to carry his message to television and radio in the waning days of the campaign.
The list includes some of Hollywood’s big names — Samuel L Jackson, Natalie Portman and Scarlett Johansson and music stars such as Katy Perry.
Amongst his supporters, he can also count on Hollywood A-listers ranging from Robert Redford to Leonardo DiCaprio; and from Barbra Streisand to Morgan Freeman.
Actor George Clooney is perhaps Obama’s most tireless supporter in Tinsel Town, having hosted a fundraiser for the president at his home in Los Angeles in May. The event raised nearly $15m.
On Saturday, Stevie Wonder played an unannounced concert for voters queuing to vote early in Cleveland. Wonder opened a rally for Obama by rocking the arena at the University of Cincinnati with a rendition of Keep on Running.
Songwriter John Legend and actor Laurence Fishburne were among those who went to Ohio to lead a “Souls to the Polls” effort with local churches.
Samuel L Jackson, Anne Hathaway, and Scarlett Johansson were all busy talking to Top 40 radio stations. Jackson and comedian Chris Rock appeared on stations with primarily African American audiences urging voters to go to the polls.
Danny DeVito and members of the FX sitcom It’s Always Sunny in Philadelphia have canvassed neighbourhoods in Wisconsin, made phone calls and visited colleges in the state.
Others on the Obama list include Black Eyed Peas front man Will.i.am and rock band leaders such as Jim James of My Morning Jacket and Jeff Tweedy of Wilco.
But in the meantime, the 1970s singing icon Meat Loaf will do anything for… Mitt Romney. The star appeared with Romney in Ohio at a large rally and did a unique rendition of America the Beautiful. But according to TMZ, Loaf apparently didn’t register in time to vote in Texas, so he won’t be able to help Romney at the polls.
Kiss frontman Gene Simmons is a big supporter of Mitt Romney; he supported Romney during the GOP primary season. Simmons said he voted for Obama in 2008, but he’s concerned about the economy.
“President Obama is a wonderful family man. And that’s about where the resume stops,” Simmons said recently.
Martin Sheen played a president on The West Wing and is a high-profile Democratic supporter.
But what makes his stance on the current election unusual is his very public disregard for Mitt Romney.
“He is, in essence, a very arrogant, very successful businessman [who] believes in unreined free enterprise,” Sheen said.
And those were some of his nicer comments.
The irrepressible Material Girl Madonna managed to endorse Obama and insult her fans at the same time, a one of her concerts recently.
In the state of New Orleans, Madonna told concert goers to vote, as long as they voted for Obama. The boos soon followed. Also on her current tour, Madonna told fans: “We have a black Muslim in the White House.”
Elsewhere, a celebrity cat (of sorts) in California makes predictions for events by showing which litter box he prefers.
Mr Nuts, 10, has correctly predicted Super Bowl outcomes, but this year’s presidential race may be his biggest test yet.
At a Fremont, California, pet furniture store, Mr Nuts was presented with two litter boxes and he “did his business” in the Romney litter box, meaning that he believes Obama will win the election.
A local newspaper says Mr Nuts’ owners are diehard Romney supporters.