What's the difference between a fascist and an "anarchist" who does everything they can to kneecap the only viable left leaning political party in the US?

Left leaning? According to who or what? If you said socially progressive there might be a point here, but the democratic party is no where near left wing. And the social progressiveness only serves to take advantage of those being oppressed in order to win votes. It's hollow, and when people start losing rights (like women and abortion) the Democrats will make 500 excuses about why they can't do anything, instead of actually doing something. The democratic party serves as a ratchet to kill and absorb left wing movements and keep the acceptable discourse within the sphere of economic liberalism.

I'm begging Americans to read literally anything about their political system from a non American, non Eurocentrist perspective. Begging. I'll start by linking some here.

The specific combination of factors in the historical formation of U.S. society—dominant “biblical” religious ideology and absence of a workers’ party—has resulted in government by a de facto single party, the party of capital. The two segments that make up this single party share the same fundamental liberalism. Both focus their attention solely on the minority who “participate” in the truncated and powerless democratic life on offer. Each has its supporters in the middle classes, since the working classes seldom vote, and has adapted its language to them. Each encapsulates a conglomerate of segmentary capitalist interests (the “lobbies”) and supporters from various “communities.”

American democracy is today the advanced model of what I call “low-intensity democracy.” It operates on the basis of a complete separation between the management of political life, grounded on the practice of electoral democracy, and the management of economic life, governed by the laws of capital accumulation. Moreover, this separation is not questioned in any substantial way, but is, rather, part of what is called the general consensus. Yet that separation eliminates all the creative potential found in political democracy. It emasculates the representative institutions (parliaments and others), which are made powerless in the face of the “market” whose dictates must be accepted. Marx thought that the construction of a “pure” capitalism in the United States, without any pre-capitalist antecedent, was an advantage for the socialist struggle. I think, on the contrary, that the devastating effects of this “pure” capitalism are the most serious obstacles imaginable.

Samir Amin, Revolution From North To South