The fact that the current administration has pursued fascist means of governance does not imply that all who voted for Trump automatically support fascism; that implication speaks to the brand of identity politics currently (though wrongfully) being blamed on liberals, so I think avoiding arguments so easily dismissed within the mainstream will lead us to more effective communication across the liberal/conservative divide.
If anything, the waning support of former Trump voters should be encouraging to those interested in building liberal coalitions around populist agendas. I’m not saying that we shouldn’t be worried about what’s going on right now or actively working against it, but I hope we can keep an eye on the long-term situation while we’re doing it, which means the House in 2018 and getting rid of this embarrassment in 2020.
As far as your notion of autonomy goes, California’s threat to withhold taxes presents an interesting take on that scenario. I’ve heard small bits here and there about tax reform in Washington; if we got serious about it (nevermind if we restructured our ridiculous cannabis laws), the money generated could definitely be a point of leverage in terms of maintaining a more reasonable balance of power between the state and federal level..