My guess is this is just a head fake from Rudy to throw off the Dems, but if McCain did pick somebody like Joe Lieberman it would be game changing.

From CNN:

Rudy Giuliani, former presidential candidate turned John McCain supporter, said Thursday that a Democrat could conceivably occupy the number 2 spot on the Republican presidential ticket.

“The reality is either way you might see something like that,” the former New York City mayor told CNN’s Kiran Chetry on American Morning when asked about talk of Sen. Barack Obama choosing a Republican like Sen. Chuck Hagel as his running mate.

Giuliani said he has not spoken with McCain about possibly choosing a Democratic running mate. “But, if you’re asking me is it possible in this day and age that you could have a ticket like that? I think so.”

Again, I’m not holding my breath, but if John did pick a Dem who would it be and why?

Politics Guiliani Hints At Dem For McCain Veep?