It's kind of like his old show, "The Apprentice." Like some of the contestants on the show, Trump steals all of the attention. And like the show, where contestants on the winning team did not have to go to the boardroom to face elimination, Trump's standing in the polls keeps him from getting "fired."
What is Trump's secret? He says what he feels like saying and doesn't care what people think of him. He loves the attention and never apologizes at all for anything. It's all about style.
Trump only loses if voters care about substance.