TUCSON, AZ - MARCH 26: U.S. Sen. John McCain (R-AZ) and former Alaska Gov. Sarah Palin (L) attend a campaign rally at Pima County Fairgrounds on March 26, 2010 in Tucson, Arizona. Palin traveled to Arizona to stump for McCain, who is facing a primary challenge in his bid for a fifth term in the Senate. Today's event marked the first time the pair had campaigned together since their failed 2008 presidential run. (Photo by Darren Hauck/Getty Images)
