He's in!

From Fox News: "Well, Jay, after thinking for a long time my decision is ... " he began to tell Leno before the TV screen showed a "Please Stand By" sign. When the picture finally returned, he said: "That's why I decided that way."
When the actor finally confirmed he was running, "The Tonight Show" audience in Burbank erupted in whoops and cheers. A camera in the press room showed several reporters cheering as well.