Jeb Bush, meanwhile, is at 7 percent, John Kasich at 6 percent and Ted Cruz at 5 percent. No other Republican gets more than 3 percent.

Back in July’s NBC/WSJ poll, Trump was in first place at 19 percent, Scott Walker (who exited the race on Monday) was second at 15 percent, Bush third at 14 percent and Carson fourth at 10 percent. Rubio was just at 5 percent, and Fiorina didn’t register at all in the poll.

Adding both first and second choices, Carson tops the current GOP field at 35 percent – followed by Trump at 31 percent, Fiorina at 28 percent, Rubio at 26 percent and Bush at 19 percent.

The NBC/WSJ poll was conducted Sept. 20-24 — so mostly after Walker suspended his campaign on Sept. 21. Only one GOP primary voter (out of 59 interviews) had selected Walker before he was removed from the survey.

In the Democratic race, Hillary Clinton is the first choice of 42 percent of primary voters, Sanders is in second at 35 percent and Joe Biden third at 17 percent. No other Democrat gets more than 1 percent.