McCain has all but sewn up the nomination, even before his impressive win in Virginia that should prove Mike Huckabee is simply not viable as any threat to the McCain Campaign. In fact the best strategy for Huckabee now is to suck up to McCain in the hopes of a VP nomination that is less likely to be forthcoming if he simply gums up the works and makes McCain look bad. That said, he's clearly hoping to have some leverage at the convention with enough delegates to be able to secure a VP spot. This appears less likely after yesterday's loss in Virginia.
What about Ron Paul? Arguably the most passionate and articulate spokesperson of the values Republicans claim to hold dear remains in the race, but with too little support to make much of a difference. His internet popularity was very interesting but failed to turn his campaign into the powerful force that Huckabee's became. I think Paul actually had more money initially than Huckabee and may still be pulling in more donations.