Ronald Reagan/George H W Bush
Heh, okay, I get it, I get it :)
And I didn't remember that, that Bush was Reagan's primary opponent. Huh. (Well, I -was- only 11 at the time). So did the media trumpet what criticisms there were? Or did those two run a substantially less acrimonious primary than John-John have?
What was the last example prior to Reagan/Bush? At that rate, it was probably no later than 1956 or so.
Qwinn