In what way do you think one of those three is better than Lieberman? I’ll give you a hint: All four are social Liberals. All of them show Socialist tendencies.
Romney is for drilling in ANWR as an example. Mitt does not follow the global warming theory and on I can go. From hearing Mitt on talk radio and the speeches he has given I would say you are way off base. Giuliani is not as far left as Lieberman.
As to Crist I have not heard anything I like except his turn around on offshore drilling. The only thing Lieberman has going for him is his support on the war on terror.