Contrast the failures of presidents Lyndon Johnson, Richard Nixon and Jimmy Carter.

FORBES: The Newt Gingrich Swing: For The Fences

That has happened four times in the last 60 years including in 1948 (Thomas Dewey), 1968 (Richard Nixon), 1976 (Jimmy Carter) and 1980 (Jimmy Carter).

CNN: Stay tuned for another swing in the campaign