Democratic National Committee

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Democratic National Committee Chairwoman Debbie Wasserman Schultz and others went on offense on Sunday news shows against the presumptive GOP presidential nominee. (Associated Press)

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ASSOCIATED PRESS Michelle Obama steps into 2012 presidential campaigning on Thursday with a speech to the Democratic National Committee's Women's Leadership Forum.

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**FILE** Rep. Debbie Wasserman Schultz of Florida chairs the Democratic National Committee. (Associated Press)

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Associated Press Rep. Debbie Wasserman Schultz, Florida Democrat, acknowledges the crowd at a meeting of the Democratic National Committee on Wednesday in Washington, at which she was elected DNC chairwoman. Mrs. Wasserman Schultz was handpicked by President Obama.

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Associated Press Rep. Debbie Wasserman Schultz, Florida Democrat, acknowledges the crowd at a meeting of the Democratic National Committee on Wednesday in Washington, at which she was elected DNC chairwoman. Mrs. Wasserman Schultz was handpicked by President Obama.

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** FILE ** President Obama is introduced by White House Senior Adviser David Plouffe before the president speaks at a Democratic National Committee event in Washington on Wednesday, March 16, 2011. (AP Photo)

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**FILE** Tim Kaine served as chairman of the Democratic National Committee in 2009-11. (Associated Press)

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** FILE ** Democratic National Committee Chairman Tim Kaine addresses a rally at the University of Delaware on Tuesday, Sept. 28, 2010, in Newark, Del. (AP Photo/Rob Carr)

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Vice President Joe Biden shakes hands with Democratic National Committee Chairman Tim Kaine during the summer meeting of the Democratic National Committee, Friday, Aug. 20, 2010, in St. Louis. (AP Photo/Jeff Roberson)

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Democratic National Committee Chairman Tim Kaine speaks during the DNC's summer meeting, Friday, Aug. 20, 2010, in St. Louis. (AP Photo/Jeff Roberson)

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Health and Human Services Secretary Kathleen Sebelius speaks during the summer meeting of the Democratic National Committee, Friday, Aug. 20, 2010, in St. Louis. (AP Photo/Jeff Roberson)

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Sen. Claire McCaskill, D-Mo., addresses the summer meeting of the Democratic National Committee, Friday, Aug. 20, 2010, in St. Louis. (AP Photo/Jeff Roberson)

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Vice President Joe Biden gestures while addressing the summer meeting for the Democratic National Committee, Friday, Aug. 20, 2010, in St. Louis. (AP Photo/Jeff Roberson)