the left is winning the narrative, because their target is the most cowardly of the congressional Republicans. By casting doubt on Trump’s legitimacy in their minds, they can be intimidated into opposing Trump’s agenda. The Dems expect that we will punish the Republicans for failing us by not voting for the incumbents in the midterms, making it possible for the Dems to retake congress.
The GOP wins elections because we want something other than liberalism. The Dems get that, and it scares them. The GOP leadership does not get that.
We shall see. We've never had a president who would conceivably call congressmen of his own party in and say "I am going to publicly endorse your next primary opponent and campaign for him in your district if you won't support my agenda." Now it could happen. We'd see who the cowards fear the most after that!