He's alluding to the Hillary/Bernie schism in the Dem Party.
The Dems are showing multiple fracture lines right now. "People of Color" versus the white old leadership. Hard left "progressives" against moderate liberals. Transgenders versus "non trans inclusive" feminists.
Yes, Republicans have fracture lines, the GOP Establishment and "cheap labor" globalists versus Trump supporters, but their fracture lines are deeper.
Expect an explosion as the 2020 season ramps up, and the factions find it hard to get behind any single candidate.
True. I read an article recently, which listed about 25 different Democrats who they consider possible presidential candidates in 2020. Can you imagine that many in the Iowa caucuses and New Hampshire primary? Would those contests still perform their usual function as qualifying rounds for presidential campaigns?