Two points on Nelson Rockefeller:
1) He served as Vice President under Ford until January 1977.
2) A “Rockefeller Republican” is an apt description of Mittens and is a widely-understood and accepted political term for a wealthy, northeast, liberal republican - used to derisively hang a label on a politician such as, well, Romney.
George Romney is the example you find in the textbooks, but like father like son.