Barack Obama’s campaign shows no sign of distancing itself from Hollywood. A case in point was the president’s final visit to Los Angeles before the election, in which he appeared at a Sunday concert at L.A. Live’s Nokia Theater that included Katy Perry, Stevie Wonder, Earth, Wind & Fire and Jon Bon Jovi. Before some 6,000 donors, Obama tried to make levity out of a lackluster debate performance, cracking that the musicians are “such great friends, and they perform flawlessly night after night,” he said. “I can’t always say the same.”When George Clooney came on stage at the Nokia, he made a veiled reference to Clint Eastwood’s Republican convention appearance, noting how it wasn’t always good for a star to take to the stage and speak on behalf of the candidate. The audience got the joke.