Madonna was booed during her "MDNA Tour" concert in New Orleans on October 27, 2012, after urging fans to vote for President Obama. "I don't care who you vote for as long as you vote for Obama," she told the crowd before adding, "Seriously, I don't care who you vote for ... Do not take this privilege for granted. Go vote." (Photo by David Becker/Getty Images)
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Help or hindrance, Hollywood stars have been putting their weight behind politicians for decades.