Perhaps you’ve heard of THIS GUY:
[I]n all the early general election polling a “generic Republican” (i.e., an unnamed nominee) ran ahead of the entire field consistently. Indeed, it was often said that “generic Republican” was what [this guy] was trying to sound like. And second, what was left of the “moderate wing” of the Republican Party (still a significant share of the GOP voter base outside the South, although it’s virtually unrepresented among elected officials these days) generally supported [this guy] because of his fading “moderate” bona fides, and/or because they figured he didn’t mean all those promises he was making to movement conservatives on the campaign trail. It’s not a particularly good thing if your most intense supporters either don’t like you…or hope you are lying.