[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2009/images/06/17/art.bidenpt0617.gi.jpg caption="Vice President Biden addressed his former Senate colleagues at an event Wednesday."]
WASHINGTON (CNN) - Joe Biden returned to his old stomping grounds Wednesday wearing three hats: vice president, historian, and comedian.
Biden delivered the keynote address at the Senate Democratic Steering and Outreach Committee's Green Jobs Summit.
The vice president needled his former colleagues. "I just want to remind you guys I hope you remember me. I used to work here. So easily how they forget," he said.
Biden served in the Senate for 36 years before being elected vice president.
The summit was held in the caucus room of the Russell Senate office building, which inspired Biden to discuss the room's history.
"It's good to be home in this room. This is - business folks and labor leaders probably know - but this is one of the most historic rooms in the United States Senate," said Biden.
"John Kennedy announced his run for the presidency here. This was the room in which the Bork hearing took place. And this is the room in which the Clarence Thomas hearing took place. Over which I presided on both of them and I am so glad to be here not talking about the Supreme Court. Umm... laugh a little bit, guys. Come on - you're a stiff audience here, man."
–CNN's Virginia Nicolaidis contributed to this report.