Both parties broadly promote global US military and economic supremacy (unipolarity), draconic IP laws, corporate tax benefits, social division on immutable identity issues, anticommunism, etc. There is wiggle room (i.e. Overton window), as you point out, but the main thrust is clear and opposition is not tolerated in an institutional sense.
At best, the establishment Dems have been passive observers to the catastrophic erosion of social systems over the past 50 years.
Yeah, the parties are going to have things they agree on. The question is how much is that agreement out of line with what the citizenry want, or at least, what they think they want until the consequences of wanting that is rammed home by reality.
> Both parties broadly promote global US military and economic supremacy (unipolarity)
They seem to be doing a pretty bad job of preventing the rise of China as a second pole.
> Both parties broadly promote global US military and economic supremacy (unipolarity),
Maybe that's the goal but the execution is lacking. Seen from outside the USA it seems that the influence and the prestige of the United States are lower now than at any time in my life. The apex was any year in the 90s.
Obama started the trend. Trump accelerated it. Dealing with allies as if they were enemies doesn't help to keep a supremacy. Everybody needs friends, even big countries.
At best, the establishment Dems have been passive observers to the catastrophic erosion of social systems over the past 50 years.