Musicians Fher Olvera, left, and Sergio Vallin of Mana perform during a campaign event for President Barack Obama at Desert Pines High School on Sunday, Sept. 30, 2012 in Las Vegas. Obama is spending three days in Henderson, Nevada to prepare for the first presidential debate on Oct. 3 in Denver against GOP challenger Mitt Romney. (AP Photo/David Becker)

Associated Press
Musicians Fher Olvera, left, and Sergio Vallin of Mana perform during a campaign event for President Barack Obama at Desert Pines High School on Sunday, Sept. 30, 2012 in Las Vegas. Obama is spending three days in Henderson, Nevada to prepare for the first presidential debate on Oct. 3 in Denver against GOP challenger Mitt Romney. (AP Photo/David Becker)
Musicians Fher Olvera, left, and Sergio Vallin of Mana perform during a campaign event for President Barack Obama at Desert Pines High School on Sunday, Sept. 30, 2012 in Las Vegas. Obama is spending three days in Henderson, Nevada to prepare for the first presidential debate on Oct. 3 in Denver against GOP challenger Mitt Romney. (AP Photo/David Becker)
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