Interesting to note that Wisconsin voted every time for Nixon (5 elections) when he was the presidential or vice-presidential nominee.
In 1972, however, Wisconsin was one of George McGovern's better states, voting 6.74% more Democratic than the national average; Nixon won it by 9.68%.
Humphrey did a bit better than JFK as well.
Humphrey losing Wisconsin to Nixon is far more of a head scratcher than Kennedy losing it. As a Senator from neighboring Minnesota, Humphrey was considered “Wisconsin’s third Senator”.