Rudy Giuliani voters who switched to John McCain proved critical in McCain's latest come-from-behind victory in Florida. In fact, it's safe to say that the Rudy voters who switched to McCain were more important than any Huckabee voters who might have switched to Romney. The reason for this is simple: There were a lot more Rudy voters in Florida to begin with.
Rudy's support today greatly strengthens McCain's bona fides as a mainstream conservative who can reach out to independents and Democrats. Should Huckabee choose to support McCain his endorsement will strengthen McCain in the other direction.
BTW: It's time for Huckabee to find his exit strategy. Huck's "Oh Happy Day!" stance last night in the face of a dismal showing was pitiful. The time has come to say "Huckabye!"