Well, I dunno, Dennis Kucinich, who was arguably a farther left major party Presidential candidate than Sanders, also turned around and supported Trump, who was a far right candidate, up until the Jan. 6 riot.

So, yeah, I can easily someone far right supporting Sanders, the flip side of that.

Like now-mask-off MAGA rightist Tulsi Gabbard, who also supported Sanders, before running herself. (Actually, a weirdly large number of rightist have come out of the Sanders camp; well, weird if you think of politics as simple one-dimensional spectrum.)