To be properly pessimistic...
I've said before that the current US political situation is sharply reminiscent of antebellum US history. The slaver's revolt was preceded by a decade's worth of increasingly overt attempts to subvert US democracy.
Back then, the abolitionists controlled the majority of US industry and military, as well as the executive; this was crucial to their eventual success. Later, 20th century conflicts emphasised the point that wars are won by logistics. Every soldier in the field is backed by ten support personnel working to feed them fuel, food and ammunition, and technology has the ability to massively amplify individual effectiveness.
So, what's the balance of forces these days?
1) Military and paramilitary (AKA police). Heavy advantage to the right; the majority of American armed forces (both military and civilian) are authoritarian extremists.
2) Industry. Advantage to the left, although I'm not sure how strongly. California has a shitload more factories than Alabama, but offshoring has bled industrial capacity across the country.
3) Economy. Heavy advantage to the left. Financially, the red states are mostly unproductive parasites on the industrialised regions.
4) Technology. Heavy long-term advantage to the left, may not be relevant in the short term. The non-fascists have most of the scientists, but the fascists have plenty of engineers. And tech progression may not matter when both sides have nukes from day one.