FILE - In this Sept. 26, 2012 file photo, Republican presidential candidate, former Massachusetts Gov. Mitt Romney listens as Mike Rowe, host of television show "Dirty Jobs" speaks during a campaign stop at American Spring Wire in Bedford Heights, Ohio. Whatever their political beliefs, some artists perform an age-old ritual: warming up the crowd before a political rally, generating enthusiasm and all-important buzz for events that otherwise could be overlooked in a crowded news cycle. For politicians _ even those as well known as President Barack Obama and Romney _ celebrity warm-up acts can provide validation by taking them out of the political realm into popular culture, said Darrell West, director of governance studies at the Brookings Institution think tank in Washington. (AP Photo/David Richard, File)

Associated Press
FILE - In this Sept. 26, 2012 file photo, Republican presidential candidate, former Massachusetts Gov. Mitt Romney listens as Mike Rowe, host of television show "Dirty Jobs" speaks during a campaign stop at American Spring Wire in Bedford Heights, Ohio. Whatever their political beliefs, some artists perform an age-old ritual: warming up the crowd before a political rally, generating enthusiasm and all-important buzz for events that otherwise could be overlooked in a crowded news cycle. For politicians _ even those as well known as President Barack Obama and Romney _  celebrity warm-up acts can provide validation by taking them out of the political realm into popular culture, said Darrell West, director of governance studies at the Brookings Institution think tank in Washington.  (AP Photo/David Richard, File)
FILE - In this Sept. 26, 2012 file photo, Republican presidential candidate, former Massachusetts Gov. Mitt Romney listens as Mike Rowe, host of television show "Dirty Jobs" speaks during a campaign stop at American Spring Wire in Bedford Heights, Ohio. Whatever their political beliefs, some artists perform an age-old ritual: warming up the crowd before a political rally, generating enthusiasm and all-important buzz for events that otherwise could be overlooked in a crowded news cycle. For politicians _ even those as well known as President Barack Obama and Romney _ celebrity warm-up acts can provide validation by taking them out of the political realm into popular culture, said Darrell West, director of governance studies at the Brookings Institution think tank in Washington. (AP Photo/David Richard, File)
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