Huckabee adds Arkansas, for a total of three states (including the West Virginia caucus). He could also win Georgia and Alabama. That would be five states. Romney so far has Massachusetts. (Do they listen to a lot of talk show radio there?) Unless Romney can pull out Missouri and/or California he will have little rationale for continuing. If you lose the Northeast, California and the South where do you go from there?
And McCain picks up winner-take-all Delaware.