What's a president to do when his reelection campaign suddenly seems like it's in peril? Stop by a Katy Perry concert, naturally.

Perry -- along with Bon Jovi, Stevie Wonder and Earth, Wind & Fire -- performed at a rally for Barack Obama's campaign on Sunday night in Los Angeles. The event, which was attended by the president, George Clooney and about 6,000 supporters, was part of previously planned push called "30 Days to Victory."

Obama also appeared at events at the home of DreamWorks Animations CEO Jeffrey Katzenberger and Wolfgang Puck's WP24 restaurant. The busy day was filled with the president's jokes about his own performance in the first presidential debate of the campaign. After noting his fascination with the fact that the singers at the concert performed flawlessly every night, Obama deadpanned, "I can't always say the same."

As evidenced by videos posted online "Firework" (above) and "Let's Stay Together" were on Perry's setlist. Tickets for the event ranged from $44 (for attendees under the age of 40) to $250. Obama has enjoyed a great deal of success with the music industry, having recently stopped by a fundraiser hosted by Jay-Z and Beyonce at the rapper's 40/40 Club. That event brought in $4 million for the campaign.

A slew of performers, from Tom Morello of Rage Against the Machine to the Silversun Pickups and Dee Snider, have publicly denounced the Romney-Ryan.

But not all musically inclined celebrities fall on the left of the political spectrum: Kid Rock is an avowed Romney fan who has performed for the GOP nominee, and Ted Nugent and Hank WIlliams Jr. have made a number of fiery statements about the president.

Perry was apparently quite excited to be a part of the event, if this photo that she posted of her nails is any indication:

Appropriate nails. on Twitpic

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