Especially since he couldn't even win his own freaking STATE!
You're of course talking South Dakota here, with three electoral votes.
The appeal of George McGovern, who was U.S. Senator from there 1963-1981, to South Dakotans was his personal manner and style, his Great Plains modesty and simplicity.
Also, that he understood the importance of agriculture.
Despite all his goofy ideas, South Dakotans kept him because he was one of them, and South Dakota was (sincerely) the most important thing to him.
To have him as senator, fine; but as a North Vietnam-loving socialist president, no.
Karl Mundt (R), the other senator from South Dakota about the same time, 1948-1973, was one of the most conservative senators in Congress, closely reflecting the attitudes and sentiments of South Dakotans, but if he hadn't been one of them, South Dakota the most important thing to him, his ideology wouldn't have kept him in office.
South Dakota's a pretty small state, but they take their importance seriously. This is a lesson that a couple of other (former) (R) senators and a (former) (R) congressman never learned.
Tom Daschle (D) (1987-2005) was initially popular for his South Dakotaness, but after he became Democrat leader in the Senate, he made a grievous error in supposing national issues were more important than state issues.
Too bad for Tom.