Sen. Arlen Specter has lost his fight with cancer, his family announced. Sen. Specter was the longest serving Senator in Pennsylvania’s history. He was a Republican for the majority of his term, however he switched to become a Democrat in 2009. He was one of three Republicans to vote for the stimulus, and became the sixth vote for the Democrats in the Senate. Sen. Specter switched to become a Democrat after fearing a primary challenge from the right. However, he ended up losing his Democratic primary to then-Rep. Joe Sestak, who ended up losing to now Senator Pat Toomey. Sen. Specter was 82 years old.