McConnell and Romney have already done their dirty work for them.
Take amnesty for instance. A Democrat controlled Senate could easily get rid of the filibuster rule and ram through amnesty with 50 votes. But why do that when they can get some GOP votes for the 60 vote cloture, pass amnesty and stoke a GOP intra party civil war? When Republicans are fighting each other they are not engaging Democrats. That’s why Romney is always trying to start a food fight with POTUS.