the red hot chili peppers and danny devito. and not to be outdone katy perry even vol unteered to write hillary's theme song, and kim kardashian -- >> well, it is a kind of affirming the existing beliefs. if you are waivering about a candidate. ♪ >> reporter: a measurable effect. and remember 2008, many recogni recognizable faces backed then candidate barack obama. but it was this face who pumped his polls. >> i am here because of my personal conviction about barack