** FILE ** In this April 11, 2011, file photo, Elizabeth Warren, then-assistant to the president, speaks during a summit on consumer protection by the National Association of Attorneys General in Charlotte, N.C. The consumer advocate Warren is jumping into the Massachusetts race against Republican Sen. Scott Brown. (AP Photo/Chuck Burton)

Photo by: Chuck Burton

** FILE ** In this April 11, 2011, file photo, Elizabeth Warren, then-assistant to the president, speaks during a summit on consumer protection by the National Association of Attorneys General in Charlotte, N.C. The consumer advocate Warren is jumping into the Massachusetts race against Republican Sen. Scott Brown. (AP Photo/Chuck Burton)