Former Pennsylvania Rep. Joe Sestak announced on Sunday that he is running for president, becoming the 25th Democrat to join the race.
Catch up quick: The 67-year-old Sestak is a former 3-star admiral and and was the "highest ranking military officer ever elected to Congress" from 2007 to 2010. Sestak graduated from the U.S. Naval Academy and has a Master's and a PhD from Harvard. He made two failed bids for Senate in 2010 and 2016, earning the Democratic nomination in his first run but falling short in his second.