U.S. Sen. Elizabeth Warren, D-Mass., waves to the crowd after her introduction at the Netroots Nation conference in Detroit on July 18, 2014.
U.S. Sen. Elizabeth Warren, D-Mass., waves to the crowd after her introduction at the Netroots Nation conference in Detroit on July 18, 2014. David Coates The Associated Press file
U.S. Sen. Elizabeth Warren, D-Mass., waves to the crowd after her introduction at the Netroots Nation conference in Detroit on July 18, 2014. David Coates The Associated Press file