Article Photos: THE RACE: Both sides get help from musical friends



President Barack Obama walks out of the Oval Office in Washington, Wednesday, Oct. 17, 2012, to the South Lawn, to board Marine One for a day of campaign events in Iowa and Ohio. (AP Photo/ Evan Vucci)

President Barack Obama walks out of the Oval Office in Washington, Wednesday, Oct. 17, 2012, to the South Lawn, to board Marine One for a day of campaign events in Iowa and Ohio. (AP Photo/ Evan Vucci)