Cheney is a very valuable VP..May God watch over him.
Eisenhower's VP lost to Kennedy..won 8 years later. Ford was President after Nixon's resignation,lost to Carter. Bush sr is the only VP that has won since Calvin Coolidge. Gore lost to GW...
Both Roosevelt and Kennedy died in office, putting their VPs into the Presidency.
Replacing the VP with a potential Presidential candidate does not seem to be the great leg up that everyone speculates it would be.
Walter Mundale. A man with the soul of a vice president (Gene McCarthy said).
Calvin Coolidge became President when Harding died in office...he never ran for President except as the incumbent in 1924.