We don't hit Romney. At all, only at the grassroots level. Romney might need us in the general so he will have to make concessions to Paul, and Paul MIGHT have to do the same to him if Paul wins.
Romney is a smart man and a great speaker, dominating, was a douchebag last campaign (Mickelson interview I think it was), but realizes that we are his biggest threat and respects that, but his political principles are truly unknown.
He's a liar but will most likely be a moderate if elected. I'd rather have him than Bachmann, Santorum, and especially Gingrich. Huntsman would be more preferable but of course #1 is Paul, as is #2 and #3.
It's just politically bad to attack Romney because neither side truly knows how much they'll need the other to win the general. Politics is about coalition building and that's the hard truth.
There might be some mutual respect between Romney and Paul this time around. Romney understands power, and the fact that the biased media tried to make everyone kingmaker other than Paul and Huntsman (they considered Santorum but he's too bigoted) and yet Paul rises to frontrunner status speaks volume. There is probably some mutual respect and I hope that will translate to our movement growing in the future even in the case of a Romney win.