Elizabeth Warren

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** FILE ** These 2012 file photos show incumbent Sen. Scott Brown, R-Mass., left, and Democratic challenger Elizabeth Warren, in Boston. (AP File Photos)

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Democratic U.S. Senate candidate Elizabeth Warren won the endorsement of the Professional Fire Fighters of Massachusetts. She addressed a gathering outside a firehouse in Boston on Wednesday. Mrs. Warren is running against incumbent Republican Sen. Scott P. Brown. A recent poll show him with 20-point advantage among male voters. (Associated Press)

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** FILE ** Sen. Scott Brown, Massachusetts Republican, left, shakes hands with his Democratic challenger Elizabeth Warren, right, on the set before their first debate as moderator Jon Keller, center, looks on, Thursday, Sept. 20, 2012, in Boston. (AP Photo/Michael Dwyer)

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A Public Policy Poll finds Democrat Elizabeth Warren leading Sen. Scott P. Brown 48 percent to 46 percent for the U.S. Senate seat in Massachusetts held by the Republican. (Associated Press)

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Elizabeth Warren, candidate for US Senate in Massachusetts addresses the Democratic National Convention at the Time Warner Arena in Charlotte, N.C., on Wednesday, September 5, 2012. (Andrew Geraci/ The Washington Times)

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Elizabeth Warren, Massachusetts Senate candidate, addresses the Democratic National Convention in Charlotte, N.C., on Wednesday, Sept. 5, 2012. (Associated Press)

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Massachusetts Senate candidate Elizabeth Warren waves Aug. 23, 2012, as she campaigns in Methuen, Mass. She is accompanied by Methuen Mayor Stephen Zanni. (Associated Press)

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U.S. Sen. Scott P. Brown, Massachusetts Republican, says he is trying to keep taxes low to help businesses grow, while portraying Democratic challenger Elizabeth Warren as a "jobs destroyer" who favors a heavier tax burden. But he has sided with Democrats, too, while in Washington. (Associated Press)