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FILE - In this Aug. 10, 2010 file photo, actress Julia Roberts attends the the world premiere of 'Eat Pray Love' at the Ziegfeld Theatre, in New York. (Moviegoers may want to take two bites of the same apple next year: A pair of live-action adventure flicks based on Snow White will come out in theaters just months apart. (AP Photo/Evan Agostini, File)

Celebrity endorsements

Help or hindrance, Hollywood stars have been putting their weight behind politicians for decades.