one extra point about michigan.
it doesn't appear on romney's list of states in which he is going to advertise heavily.
so i think the republicans' internal polling shows little chance of success.
the final surge will be decided by (1) the dems extensive ground game, and (2) the repubs ad spend.
also, if romney is seen to be a lemon by his deep pockets supporters, his money is going to dry up.