The odious rivalry between Donald Trump and Jeb Bush has become one of the most gripping and enduring plotlines of the 2016 presidential race.

Even if the braggadocious New York billionaire doesn’t see the demure former Florida governor as a serious threat in his path to the Republican nomination, he still relishes making time to tear into him.

When Trump was asked whether Monday’s visit to South Carolina by former President George W. Bush on behalf of his brother actually could damage Jeb’s campaign, he couldn’t resist another twist of the knife.

“He’s doing so badly,” Trump replied, “how much worse can it hurt?”

Not that much, according to a new Public Policy Polling read of the race taken after Saturday’s vicious debate.

