You have to figure 12% blacks will support him if he starts instituting Heil Hitler speeches; and 12% radical commies amongst everyone else. Someone can check me on this, but I think historically the CPUSA has constituted less than 2% of the public, so this really represents a substantial increase in the radicals.
They don’t have to identify as commies to be hard left.
Plust, you forgot at lest 80% of the Latino vote.