I can't answer for Bob but I 'spect he got really POed at the no good &%*^$*() RINO that cost Reagan that nomination and swore that he would never vote for that worthless goober as long as he lived.
Of course the no good BOS that cost Reagan the nomination was a feller named..........WHAT?
Dick Cheney?
Yup. Dick Cheney
OFF WITH CHENEYS HEAD!
Actually I was working out of the Reagan suite in 1968, and the guy that cost Reagan the nomination in both 1968 and 1976 was Strom Thurmond.