Mitt had to gamble in Michigan and not hit Santorum too hard because he and his PAC spent $2Million/day for 10 days hammering Newt in Florida. You can try to compare the two but it really doesn't pass the smell test.
There really is only one smell test here. It is the fact that Newt and Santorum have been ineffective at attacking Romney.
Romney is a liar of the first order and talks all conservative but just talks that way to win the election. His record is not that of a conservative in any way.
Somehow the voters haven’t gotten that yet.
Nobody will drop out until after Super Tuesday. If Romney gathers the momentum and wins the majority of those states, it will probably be over for Newt and Santorum.