(CNN) - Sen. Arlen Specter capped a hard fought Senate primary Tuesday night with a concession call to Rep. Joe Sestak.
"I have just called congressman Sestak to congratulate him and tell him that I think it is vital that we keep this seat in the Democratic Party, and that I will support him in the election," Specter said.
Specter gave a short speech to followers after it became clear that Sestak would carry the night.
"It's been a great privilege to serve the people of Pennsylvania," Specter said. "And it's been a great privilege to be in the United States Senate, and I will be working very, very hard for the people of the Commonwealth in the coming months."
Sestak will face Republican nominee and former Rep. Pat Toomey in the November general election. Specter switched parties and became a Democrat last year in part to avoid a primary challenge from Toomey.