Commentators are already comparing the current anti-Trump town halls with those overrun by Tea Partiers during Obama's presidency.
They're rising up in anger because of the potential loss of Obamacare, he warns.
The "Constitutional Faction" versus the "Authoritarian Faction."
The massive grassroots outpouring has fed off fears that Trump poses an existential threat to cherished aspects of American society.
“There is currently a widespread level of engagement that I’ve not seen in many, many years," a former Democratic lawmaker observes.