Article in today’s Sioux Falls Argus Leader (sorry they prohibit links) that George McGovern seriously considered asking Walter Cronkite to be his vice presidential running mate in 1972. Cronkite later is to have said he would have accepted McGovern’s offer.
I seriously doubt McGovern would have won anyway but the choice would have given him a much better chance of defeating Nixon than the whole Eagleton/Shriver affair.