Katy Perry, Jon Bon Jovi, more rally behind Obama

Katy Perry, Jon Bon Jovi, Jennifer Hudson, Stevie Wonder and Earth, Wind & Fire came together Sunday night (10/7) for a Los Angeles fundraising event for Barack Obama's re-election campaign.

The politically-charged "30 Days to Victory Concert" took place at the Nokia Theatre and drew approximately 6,000 guests, including actor George Clooney.

Decked out in star and stripes and flanked by a children's choir, Katy Perry performed her chart-topping single "Firework," as well as a cover of Al Green's "Let's Stay Together."

Obama even made light of his Wednesday (10/3) evening debate against Republican presidential candidate Mitt Romney.

"Everybody here is incredible professionals, they're such great friends and they just perform flawlessly night after night. I can't always say the same," Obama said, according to MTV.