It won't happen.
Allen will get the nomination, but he and Rudy have way to many differances for him to be on the VP slot.
Add to that that Rudys ego would never ever let him be 2nd fiddle.
My personal pick, Allen and Watts.
Rudy and McCain and Pataki will wind up with terrible numbers from splitting off votes from each other (not to mention Hagel).
My personal pick, Allen and Watts
No way that Allen puts Watts on his ticket...why? Watt does not add any balance regionally to the ticket. Allen will get the nomination (sorry Frist) but the Vice-Presidential pick will go to either Mitt Romney (MA), Rick Santorum (PA), or Condoleezza Rice (CA)...how about Jeb Bush (FL) or Rick Perry (TX)?