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Margaret Ann Williams (born December 25, 1954) is a former director of the Institute of Politics at Harvard University and is a partner in Griffin Williams, a management-consulting firm. She was the campaign manager for Hillary Clinton's 2008 presidential campaign. Following Clinton's win in the New Hampshire primary in January 2008, Williams was brought onto the Clinton campaign staff as a senior adviser. On February 10, 2008, she replaced Patti Solis Doyle as the campaign's manager.