Another candidate from MA in '08, but this one a conservative republican: Mitt Romney. He's the real deal here, although completely shackled by the dems in the house and senate. Guliani/Romney ticket would be heavy Northeast, but both have the positive name recognition it would take.
one thing about Giuliani/Romney is that maybe just maybe Romney puts both MA AND MI into play....are his conservative bona fides enough to give conservatives some hope with Giuliani at the top?
My thinking is that Santorum helps Giuliani with religoius conservatives...I don't know if Romney does that. Evangelicals especially like GWB's piety. I don't know how the Mormon thing will go over.