Everything he can.
Seriously?
I predict if Mitt beats Obama then nothing much will happen. Why should it? Mitt will just continue to do the same things only maybe not as fast or as blatantly.
If he loses to Newt or Santorum then maybe he will get a bit unhinged and pull some crap.
But and it’s the longest shot but, but if Palin is the eventual nominee and wins the election? I expect that the cities will burn and California for one will be begging for a bailout prior to her becoming President. And just perhaps Martial Law will be declared so as to halt the orderly transfer of power. You can be sure that the establishment on both sides of the aisle will do nothing to stop that.