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Sosnik is a 1978 graduate of Duke University.
Sosnik is affiliated with the Democratic Party, and notably served as the political director for President Bill Clinton during his second term. He also was a campaign strategist for Massachusetts Senator John Kerry during his unsuccessful 2004 presidential bid. Prior to joining the Clinton Administration, Sosnik was the chief of staff for Connecticut Senator Chris Dodd, and later worked with the Democratic Congressional Campaign Committee. He was most recently an informal adviser to Mark Warner, the former governor of Virginia during his preparation for a possible 2008 run for President. He is the co-author of a book, Applebee's America, about political strategy.
- Cillizza, Chris (8 January 2008). "The Fix - Sosnik to Advise Clinton Campaign". The Washington Post. Retrieved 27 March 2011.
- Young, Andrew (2010-01-30). The politician: an insider's account of John Edwards's pursuit of the presidency and the scandal that brought him down. Macmillan. p. 86. ISBN 978-0-312-64065-1. Retrieved 27 March 2011.
- Patterson, Bradley Hawkes (2002-01-01). The White House Staff: Inside the West Wing and Beyond. Brookings Institution Press. p. 211. ISBN 978-0-8157-6951-4. Retrieved 27 March 2011.
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