I don't think Cheney and Bush are going to go out of their way to benefit McCain. They'll go through the motions of being good Republicans, but neither of them likes McCain enough to hand him a prize like Bin Laden. The short time they have left in office doesn't allow them sufficient basking-in-glory time to satisfy their arrogant egos, and I don't think it's in either of their natures to share their glory with someone else, particularly John McCain. If Bin Laden is really an easy enough target that his capture could be orchestrated to coincide with a US election, they'd have done it in '04 or '06 when Cheney and Bush would have been direct beneficiaries.