I mean, its not really a purity test. It’s just kind of definitions. The political terms “right” and “left” have meant the same thing since the French Revolution. Democrats are not left wing. We can have a whole bunch of ancillary discussions about whether that means people should or shouldn’t vote for them, which I’m not interested in having, but i struggle to see how one could argue in good faith that the Democrats are left wing. Its really not even clear that Ocasio-Cortez or Sanders are “left wing” since neither seems to oppose private property rights, nor do they advocate for the weakening or abolishment of capitalism - the traditional dividing line of left and right.