You do know that social democracy draws most of their support from the working class right? Maybe less now than it used to, if nothing else because the working class itself has changed.
For the US situation to be true because of that, then the working class can't on an instinctual level relate the democrats with social democracy.
Now, the answer in the US has probably with conservative vs liberal considered being the main difference between the parties, rather than political ideologies.
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