From a Slate article discussing Mike Huckabee's use of humor and some past politicians who were funny in a good way:
Huckabee reminds me of Mo Udall, the last great punster and jester on the campaign trail who every candidate wants to quote but not emulate. "I'm Mo Udall and I'm running for president," the failed Democratic candidate said, walking into a shop. "Yeah," replied the barber, "we were just laughing about that." Candidates don't repeat Udall's better lines, like his observation that the difference between a cactus and a caucus is that with a cactus, the pricks are on the outside.
(By the way, the article argues -correctly, I think- that Huckabee's ceaseless joking will come back to haunt him rather quickly.)