So now we have a Republican Presidential candidate harshly criticizing the foreign policy of a sitting Republican President, and the Secretary of State of that Administration just as harshly attacking the candidate. Not great for party unity, one thinks, but perhaps only a foretaste of the divisiveness that would result should Mike Huckabee win the Republican nomination. For a completely different reason, a Giuliani nomination would probably have the same result--too many social conservatives are repelled by Rudy's soap-opera personal life. While Mitt Romney will never win over some doctrinaire Christian evangelicals, I think by and large he would be able to unify the party. Fred Thompson probably could do so as well, although I do not think he comes close to Romney in executive competency and energy.