Trying to find some pictures to help it sink in slightly. The RNC is the Far-Right, The DNC is Center-Right, and the actual Left is not currently represented in American politics.
The spectrum shift since the 60s is almost the polar opposite of what is described here. JFK would be a Republican in 2020 - and a fairly "conservative" Republican at that. Barry Goldwater would be completely non-viable. Meanwhile in 2020, Sanders (a Socialist) was ridiculously close to winning the Democrat nomination, and AOC and the Gang are forming the center coalition of the Democrat party.
"Cox for Congress" is either the most moronic political scientist in existence, or this is some Grade-A gaslighting.