McGovern was 1972.
Don't know if Nixon had anything to do with The Muskie crying thing or not.
These are the popular vote tallies for the 72 primaries. Note that McGovern did not have the most.
Primaries popular vote results[1].
* Hubert Humphrey - 4,121,372 (25.77%)
* George McGovern - 4,053,451 (25.34%)
* George Wallace - 3,755,424 (23.48%)
* Edmund Muskie - 1,840,217 (11.51%)
* Eugene McCarthy - 553,990 (3.46%)
* Henry M. Jackson - 505,198 (3.16%)
* Shirley Chisholm - 430,703 (2.69%)
* Terry Sanford - 331,415 (2.07%)
* John Lindsay - 196,406 (1.23%)
* Samuel Yorty - 79,446 (0.50%)
* Wilbur Mills - 37,401 (0.23%)
* Walter E. Fauntroy - 21,217 (0.13%)
* Unpledged - 19,533 (0.12%)
* Ted Kennedy - 16,693 (0.10%)
* Vance Hartke - 11,798 (0.07%)
* Patsy Mink - 8,286 (0.05%)
* None - 6,269 (0.04%)