Between the Republicans, Democrats and the Kushners, you can make a compelling, evidence-based case that the Democrats rank last in effectiveness (out of those those three groups) in stopping the 2016 MAGA agenda.
The other two groups who may have been most effective in stopping the 2016 MAGA agenda are the federal bureaucracy and judges.
Out of those five listed groups above, all of them have contempt (or worse) for the 2016 Trump MAGA base.
I classify the “2016 Trump MAGA base” as people who were supporting Trump during the 2016 GOP primaries — when the GOP establishment (including Fox News) was maneuvering harder to stop Trump from being nominated — than it did on trying to stop Obama on anything.