This photo taken June 25, 2014, shows Sen. Elizabeth Warren, D-Mass., questions Treasury Secretary Jacob Lew as he testifies at a Capitol Hill hearing examining the Financial Stability Oversight Council's annual report to Congress in Washington. Warren is quickly becoming a top Democrat fund-raising and campaigning powerhouse. Since March, she has stumped for candidates in Ohio, Minnesota, Oregon, Washington and Kentucky and has trips planned in July for West Virginia and Michigan. It's a hefty schedule for a freshman senator who not long ago was teaching law at Harvard. (AP Photo/Charles Dharapak)