Easy. It's used to fighting overmatched and underfunded opponents.
Now he's fighting an opponent with near-equal funding AND the support of the MSM. After he's torn his base apart winning the nomination.
The way you always win an election is to FIRST SECURE YOUR BASE then try to peel off a faction FROM THE DEMOCRATS.
If you PO your base you will lose no matter how many Democrat votes you get.
Romney and his Mittbots are doomed to fail.
It's the McCain template all over again - utterly destroy the careers and reputations of all primary challengers; demean, demoralize and dismiss the base, then go on vacation.
McCain's handlers thought they were throwing us a bone when he tapped Sarah Palin as the VP nominee. Once they realized that Gov Palin was not a crumb tossed from their table, but rather a rocket propelled grenade that re-ignited the conservative base, they (the GOP Establishment) spent the next 4 years trying to annihilate her.
They won't make the same "mistake" again. I look for someone like Pawlenty or Thune to get the VP nod this time. They're not even going to pretend to need the base anymore. What should be an historic landslide election is instead shaping up to be a squeaker. It may be that we lose no matter the outcome.