Cons: JoePa is 147 years old.
Pros: He is immortal and cannot be killed by conventional means, making him a good man to step in should something happen to the President.
Convincing. And he is probably the only man in America who could make McCain look spry.
Digging deeper, if we imagine a world where each president is backed up at the power-VP position by one of their superhuman endorsers that radiates longevity and awesomeness — Obama/Hogan, Clinton/Madonna, Huckabee/Norris — it would make sense that the best McCain can do is a college football coach from a second-tier program (albeit, one with a cult following).