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These two are probably pretty close to unelectable, imo. Palin is beyond scary to anyone not on the far right and Romney, well, we know what his problem is. Mike Huckabee, on the other hand, is sadly probably electable.
We don't have analogous numbers for Huckabee.
Palin is an electoral disaster, and I can't quite figure Romney except as a trimmer who can be nailed for flip-flops.
Huckabee seems to have a floor of electoral votes closer to John McCain's winnings of 2008 -- but his ceiling is near there, too. He might keep the Obama landslide near 400 EV, but he is absolutely not going to cut into the Blue Firewall unless Obama screws up badly.
Jesus Christ, already counting your chickens before they hatch eh?