[heiss]

The probability of VP becoming President is remote.

VPs go to foreign funerals and they don’t have any role in decision making. They are only good for publicity (e.g. clearly articulating and defending the policies).

In some case, President really respects the VP (e.g. Bush-Cheney) so they have influence, but this has nothing to do with the role of VP itself.

[Vigilanteman]

My old polisci teacher from back in my college freshman days used to tell this story about vice-presidents:

Two brothers grew up and chose careers. One became a sailor and went to sea. One became vice-president. Neither one was ever heard from again.

[Spirit of Liberty]

It's happened 9 times out of 44 Presidents. So not a good possibility, but still around 20%. Also, Cain will soon be 66 and has had Stage 4 cancer.

I just know I wouldn't want Romney to be VP because I don't want any chance of him becoming President one day.