Hahn is being crushed in the endorsement game. I heard that even Bob Naylor, an oldline Republican hack lobbyist, has endorsed V.
Today, it was Magic Johnson who switched to V. Hahn managed to enrage the two biggest parts of his winning 2001 coalition - blacks and SFValley whites.
I should add that I have my doubts as to whether endorsements have any effect on how people vote... however, they are an indicator of where the "smart money" thinks this thing is heading...