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UNITED STATES - MARCH 15:  Sen. Bernie Sanders, I-Vt., laughs as Sen. Barbara Mikulski, D-Md., jokes with reporters in the Senate Radio-TV Gallery studio before the start of their press conference on Social Security on Tuesday, March 15, 2011. (Photo By Bill Clark/Roll Call)

UNITED STATES - MARCH 15: Sen. Bernie Sanders, I-Vt., laughs as Sen. Barbara Mikulski, D-Md., jokes with reporters in the Senate Radio-TV Gallery studio before the start of their press conference on Social Security on Tuesday, March 15, 2011. (Photo By Bill Clark/Roll Call)

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