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WASHINGTON, DC - SEPTEMBER 18: Sen. Elizabeth Warren (D-MA) addresses a rally in support of Social Security and Medicare on Capitol Hill September 18, 2014 in Washington, DC. The rally was organized by American United for Change, a liberal advocacy group founded to fight the privitization of Social Security. (Photo by Chip Somodevilla/Getty Images)

WASHINGTON, DC - SEPTEMBER 18:  Sen. Elizabeth Warren (D-MA) addresses a rally in support of Social Security and Medicare on Capitol Hill September 18, 2014 in Washington, DC. The rally was organized by American United for Change, a liberal advocacy group founded to fight the privitization of Social Security.  (Photo by Chip Somodevilla/Getty Images)