Supporters of Republican incumbent Sen. Scott Brown and Democratic challenger Elizabeth Warren hold signs outside Symphony Hall in Springfield, Mass., Wednesday Oct. 10, 2012, prior to their third debate. (AP Photo/Elise Amendola)

Photo by: Elise Amendola

Supporters of Republican incumbent Sen. Scott Brown and Democratic challenger Elizabeth Warren hold signs outside Symphony Hall in Springfield, Mass., Wednesday Oct. 10, 2012, prior to their third debate. (AP Photo/Elise Amendola)