EXIT STRATEGY: WRATH OF THE MATH. David Gergen just speculated on CNN that Donald Rumsfeld will "fall on his sword," meaning he'll submit his twice-rejected resignation. Bush, of course, has pledged that Rumsfeld is his man. The only situation I can see whereby Rumsfeld is out at the Pentagon is if Claire McCaskill and Jim Webb win, giving the Senate to a 51-seat Democratic majority. At that point -- faced with a Democratic congress, endless investigations, subpeonas, document requests, the whole megilla -- it makes sense for Bush to reluctantly accept Rumsfeld's resignation and appoint Joe Lieberman as defense secretary.