Mitt Romney’s win looks pretty solid — 39 percent to just 30 percent for John McCain. What’s more, it would seem to be an ominous sign for John McCain that he got beaten so badly among registered Republicans. New Hampshire had an open primary, lots of non-Republicans voted, and he won. Michigan had an open primary, but not so many non-Republicans voted, so he lost. In more and more of the states going forward, however, only Republicans are going to be able to vote in the Republican primary.
Of course it’s not a two-person race, so things get much more complicated than that, but the basic shape of the river is still that Republicans need to like you if you want to win a Republican primary.