Joseph Ambrose Sestak Jr. (born December 12, 1951) is an American politician and retired U.S. Navy officer. A member of the Democratic Party, he represented Pennsylvania's 7th congressional district in the United States House of Representatives from 2007 to 2011 and was the Democratic nominee for the United States Senate in 2010, losing to Republican nominee Pat Toomey. A three-star vice admiral, he was the highest-ranking military official ever elected to the United States Congress at the time of his election.
Graduating second in his class at the United States Naval Academy, Sestak served in the United States Navy for over 31 years and rose to the rank of three-star admiral. He served as the Director for Defense Policy on the National Security Council staff under President Bill Clinton and held a series of operational commands, including commanding the USS George Washington carrier strike group during combat operations in the Persian Gulf and Indian Ocean in 2002.
Sestak was elected to the House of Representatives in 2006 in a heavily Republican district where registered Democrats were outnumbered almost 2 to 1, and reelected in 2008 by a 20% margin. [source]