Donald Trump activates the anti-Seventh-Day-Adventist prejudice against Ben Carson.

Here's how he slipped in the dagger:

I love Iowa. And, look, I don't have to say it, I'm Presbyterian. Can you believe it? Nobody believes I'm Presbyterian. I'm Presbyterian. I'm Presbyterian. I'm Presbyterian. Boy, that's down the middle of the road folks, in all fairness. I mean, Seventh-day Adventist, I don't know about. I just don't know about.

Religious prejudice is wrong... we all, most of us, know that, don't we? Or do we? We know it some or most of the time, except when we need to set it aside, such as when we choose a President, and it's got to be somebody we can trust with the nuclear button and everything else. It can't be a weirdo. We'll leave you alone as you pursue you metaphysical whimsy and even treat you with care and kindness. But for a President? Trump knows what the "folks" need: right down the middle of the road.

"I'm Presbyterian. I'm Presbyterian. I'm Presbyterian. I'm Presbyterian." 4 times he had to say it. Because "Nobody believes I'm Presbyterian."

Nobody believes.