Among Republicans, 26 percent of voters say they “would definitely not support” Trump, with 21 percent who would not back Bush.

“It doesn’t seem to matter what he says or who he offends, whether the facts are contested or the ‘political correctness’ is challenged, Donald Trump seems to be wearing Kevlar,” said Tim Malloy, assistant director of the Quinnipiac University Poll.

“Dr. Ben Carson, moving to center stage just one month ago, now needs some CPR. The Doctor sinks. The Donald soars. The GOP, 11 months from the election, has to be thinking, ‘This could be the guy.’