FYI, OK is not a "bad state". The selection of its delegates is completely separate from the primary process, and so long as enough Paul supporters turn out at the district and state conventions, they could take the national delegate seats.
Secondly, Romney's voters are not likely to swing McCain. Romney's voters are, in large part, strong social conservatives. They're much more likely to swing Huckabee. Perhaps this differs with geography, I don't know. But honestly, I think the best outcome right now would be if Huck hangs it up and Republicans are then forced to make a very explicit choice between:
1) Getting everything they've ever claimed they wanted - low taxes, smaller gov't, etc, in exchange for peace , (Ron Paul) or
2) Giving up everything they've ever wanted just so they can have their war (McCain)
I want them to have to make that choice. So far, they've fooled themselves into thinking they could have both by deceiving themselves that Romney and Huck were real conservatives on the other issues. They know for a fact that McCain is not.