I think we are most certainly seeing a division between the "progressive left," and the "liberal left." Historically, Liberals have promoted and encouraged discourse and have been strong advocates for free speech. Currently the "progressive left," is discouraging free speech, even trying to prevent such, and is not at all interested in discourse. The progressive left seems extremely interested in racial distinction and classification, whereas liberals of yore, were more interested (or professed to be more interested) in a color-blind society. Even lefty liberals such as Bill Mahr have made the distinction. Self-proclaimed liberal commentators such as Sam Harris and Dave Rubin have ardently dissociated themselves from the "progressive left."