Well, not quite... but a 1 in 4 chance.  A report quoted in MSNBC today (see: MSNBC Report) talks about the actuarial odds of McCain surviving his presidency based on his age, current health, and revealed medical records.  Well, some of his health records (see: LA Times Report).

OK, you might say... this means he's got a 75% chance of being fine.  Are you will to risk a 25% chance of Sarah Palin being president?  Can  you really say that with a straight face?

By the way... Obama's chance of dying are 4.76%.