There are no
extreme left wingers in
mainstream American politics; this "spectre haunting all that's good and right about America" is just that: a
spectre, a
myth on par with that of the "
liberal media". I'm hard-pressed to find anything left-wing happening; the
House Progressive Caucus is a mere sliver of the organizational pie chart, and they're only slightly left-of-center, on average, on a good day. The
center of gravity for American politics has been right-of-center for decades, so even a radical
moderate can look like a "leg-warmer-wearing rupturing heart liberal", I suppose.
A genuine leftist would scare the fuck out of some people. But you won't find any under this "leg-warmer" rubric. I myself wear long underwear.