Richard Bruce Cheney, Suspected Traitor, has already served two terms and can not, constitutionally, run again.
Seriously though, if G WB were impeached, resigned, or something, and Richard Bruce Cheney, Suspected Traitor, rose to the throne during the current Presidential term, would almost certainly run for the top spot in 2008.
Bashing Hillary Clinton hurts the Democratic Party.
Down ticket candidates are helped by a strong senate run by Clinton and a strong Gubernatorial run by Elliot Spitzer.
Democratic candidates for NYS Assembly seats and County Offices, especially in tight districts, benefit from a strong up-ticket and the margin can mean a Democratic pick up of a position now held by a Republican.
Hillary loathing may make one "feel good", but she's going to win the primary, and she's going to win the general election, but hurting her, hurts other Democratic candidates.