Partisan incentives during Barack Obama's presidency combined with the FBI-CIA-Democratic Party-media plot to falsely accuse President Trump of high treason with the Russians, or at least terribly insufficient patriotism, for the last 3 years have done much to confuse liberals about where they should stand. There's no question that many great leftist writers and readers out there have stayed great, but overall the numbers tell a sad story. One might wonder though if liberal voters' hearts are really in it outside of current circumstances. It seems the general presumption still stands that, while Democratic politicians and appointees love war, their voters do not.
But that's okay either way. We currently have a Republican president. Attacking America's interventionist foreign policy from the left would not be likely to do much good anyway. It's the rank and file right that is still seen as supporting a "muscular" foreign policy. But what if they don't?