San Antonio Mayor Julian Castro, left, who will be the convention keynote speaker, and his twin brother, State Representative Joaquin Castro, who is running for U.S. Congress, are interviewed at the Democratic National Convention in Charlotte, N.C., Monday, Sept. 3, 2012. (AP Photo/Charles Dharapak) President Barack Obama speaks during a campaign rally at Scott High School Monday, Sept. 3, 2012, in Toledo, Ohio. (AP Photo/Tony Dejak) The stage is seen as preparations continue before the start of the Democratic National Convention at the Time Warner Cable Arena in Charlotte, N.C., Monday, Sept. 3, 2012. (AP Photo/Charles Dharapak) Republican presidential candidate, former Massachusetts Gov. Mitt Romney and his wife Ann, leave the Church of Jesus Christ of Latter-day Saints after services on Sunday, Sept. 2, 2012 in Wofeboro, N.H. (AP Photo/Evan Vucci) President Barack Obama sits down to have breakfast with local autoworkers, Daniel Schlieman, center, Heather Finfrock, far right, and James Fayson, center with back to camera, at Rick’s City Diner, Monday, Sept. 3, 2012, in Toledo, Ohio. Serving coffee is waitress Megan Emch. (AP Photo/Pablo Martinez Monsivais) Stagehands make final adjustments to the podium on the stage at the Democratic National Convention inside Time Warner Cable Arena in Charlotte, N.C., on Sunday, Sept. 2, 2012. (AP Photo/Lynne Sladky) Production crew makes final preparation on the stage for the Democratic National Convention in Charlotte, N.C., on Monday, Sept. 3, 2012. (AP Photo/David Goldman) A Secret Service agent guards the entrance to the stage inside of Time Warner Cable Arena at the Democratic National Convention in Charlotte, N.C., on Monday, Sept. 3, 2012. (AP Photo/David Goldman) First Lady Michelle Obama listens to a production manager during a sound check for the Democratic National Convention in Charlotte, N.C., on Monday, Sept. 3, 2012. (AP Photo/Charlie Neibergall) Lt. A.C. Powers of Augusta County Sheriff's from Stanton, Va., looks down on the floor in Time Warner Cable Arena at the Democratic National Convention in Charlotte, N.C., on Monday, Sept. 3, 2012. (AP Photo/David Goldman) Demonstrators march in a Labor Day parade, Monday, Sept. 3, 2012, in Charlotte, N.C. Demonstrators are protesting before the start of the Democratic National Convention. (AP Photo/Gerry Broome) A vendor sells political buttons, Monday, Sept. 3, 2012, in Charlotte, N.C. Demonstrators are protesting before the start of the Democratic National Convention. (AP Photo/Gerry Broome) Kelly Jacobs, from Hernando, Miss., wears button laden campaign hat while touring the convention hall ahead of the Democratic National Convention in Charlotte, N.C., on Monday, Sept. 3, 2012. (AP Photo/Jae C. Hong) A delegate shows off her President Barack Obama button in the convention hall before the Democratic National Convention in Charlotte, N.C., on Monday, Sept. 3, 2012. (AP Photo/Jae C. Hong) Demonstrators march during a Labor Day parade, Monday, Sept. 3, 2012, in Charlotte, N.C. Demonstrators are protesting before the start of the Democratic National Convention. (AP Photo/Patrick Semansky) Production crew work on final adjustments at the Democratic National Convention inside Time Warner Cable Arena in Charlotte, N.C., on Sunday, Sept. 2, 2012. the Democratic National Convention inside Time Warner Cable Arena in Charlotte, N.C., on Sunday, Sept. 2, 2012. (AP Photo/Lynne Sladky)