This is getting pedantic, but
moderate progressive liberals like Secular Talk, T1J, Democracy Now! and even The Young Turks were featured on breadtube.tv. Obviously, some have since been removed, but Lindsay Ellis and Anita Sarkeesian are still proudly featured there.
Yes, these people are not radical leftists (nobody's arguing that), but the fandoms for BreadTube, ChapoTrapHouse and the like have a decidedly huge swath of radical liberals in their ranks. Radlibs may read leftist literature, squat with their buddies from town to town as travelling crust punks, organize protests and some may have the intellect to become thought leaders, but they're ultimately comfortable middle class liberals who found a niche to profit from in their time as career revolutionaries and talking heads. Radlibs love progressives because they're entry points for those seeking out left-leaning content before graduating to something more radical.