Hell, all Romney has to do is say he's for legalized pot and the entire DUmp will vote for him. 
See, I don't think so -
The DUmp's members knee-jerk react for or against anything based upon the party responsible. If Mitt supported decriminalization, they would drop weed instantly, and probably decide that it must be part of a rethug plot to get 'sheeple' stoned into complacency.