President Obama uses a cellphone to contact supporters during a surprise visit to meet volunteers at an Obama campaign office in Port St. Lucie, Fla. on Sept. 9, 2012. (Associated Press) **FILE**

Photo by: Pablo Martinez Monsivais

President Obama uses a cellphone to contact supporters during a surprise visit to meet volunteers at an Obama campaign office in Port St. Lucie, Fla. on Sept. 9, 2012. (Associated Press) **FILE**