Bernie Sanders is not the furthest left candidate in US history.
He's also not the furthest left Presidential (primary) candidate in US history.
He's also not the furthest left major party Presidential (primary) candidate in U.S. history.
Well, no.
For one thing, Sanders isn’t “far left”.
For another thing, Sanders anti-establishment populism that was seen as particularly aligned against the Democratic establishment was a draw that wasn’t really based on left-right alignment (or in some cases was, in a way directly opposed to the description of him as a leftist, for many of the same reasons he had trouble with core Democratic constituencies on guns, race, and other issues.)
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.)
And what about supporting perhaps the furthest left political candidate in US history, Bernie Sanders?