Republican U.S. Sen. Scott Brown (left) answers a question during a debate against Democratic challenger Elizabeth Warren on Monday at the University of Massachusetts in Lowell, Mass. Matt Stone/AP hide caption
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Sen. Scott Brown, R-Mass., speaks during a news conference in Boston last Friday. Elise Amendola/AP hide caption
Bill Connell of Weymouth, Mass., who supports Republican Sen. Scott Brown, stands near signs supporting Brown's Democratic challenger, Elizabeth Warren, before the candidates' first debate Thursday in Boston. Michael Dwyer/AP hide caption
Former President Bill Clinton hugs President Obama onstage after Clinton's rousing speech during the Democratic National Convention on Wednesday in Charlotte, N.C. Justin Sullivan/Getty Images hide caption
Democratic U.S. Senate candidate Elizabeth Warren addresses the Democratic State Convention before the delegate vote in Massachusetts Saturday. Michael Dwyer/AP hide caption
Massachusetts Senate candidate Elizabeth Warren is shown here attending a 2010 Capitol Hill hearing on the Troubled Asset Relief Program. Alex Wong/Getty Images hide caption
Warren, at a Congressional hearing in March. Alex Wong/Getty Images North America hide caption