There may be another 'dog-whistle' in the "Saul Alinsky" profferring by Herr Gingrich:

[A-Schwarzenegger]

6. Why Saul Alinsky is a threat to Newt:

From the opening paragraph of Alinsky's Rules for Radicals:

"What follows is for those who want to change the world from
what it is to what they believe it should be. The Prince
was written by Machiavelli for the Haves on how to hold power.
Rules for Radicals is written for the Have-Nots on how to take it away."

I agree completely with your assessment, PCI. I can't see how
Newt is going to get away with such an appeal to ignorance &
bigotry if he does get the nomination & carries the same tactic
into the General. But perhaps the fear&hatred in the American
electorate has yet to be fully tapped.