Well it is rare that the Dim vote no matter how loony the candidate drops below 40%. So I would guess 38% to 40% are either lunatic fringe or American hating Dims.
I agree with you. The fringe has been growing, thanks to a majority of leftist professors at about 95% of American colleges. Fortunately, many of these students later on realize the reality of life doesn't support the utopian nonsense of the left, so they eventually become moderates or even conservative, but it takes a while for the maturing to take hold.