Giulani is unelectable. McCain stinks, is arrogant and is a RINO - unelectable. Romney, while looking good, carries his Morman baggage. Probably not electable.
Newt is articulate, smart, a great debater and above all, a conservative. He has some baggage but the press will load anyone nominated with baggage - real or otherwise. He would eat Hillary's lunch on issues.
Reagan was able to articulate the conservative message directly to the people. Newt can do that.