I don't think we've seen a response to the charge that Obama/Biden supported the bridge to nowhere, so we don't know how accurate it is. Supporting the bridge was part of Palin's campaign, not just part of some vote. Recently the 'road to nowhere' that went to the bridge to nowhere was completed for tens of millions; local residents say they might use it for jogging or something.

It would be wrong, I suspect, to assume that members of Congress are always aware of everything they are voting for. It's not a matter of hypocracy but of complexity. People sneak in pet projects all the time.