RE: bold...that's exactly right. They impugned Trump supporters' knowledge of the Constitution.
And I'll do it again, right here, so people don't have to look for it. How in the dickens can you claim he knows the Constitution (all twelve articles of it he said he'd uphold) when there are only seven articles, ten Amendments in the Bill of Rights, and 27 Amendments total.
It is a gaffe on the level of Obama's '57 states' gaffe, only we can see where Obama got 57 states (in the Caliphate).
The number 12 doesn't fit in the Constitution. I figure if y'all were knowledgeable about the Constitution on so much as a statistical level, that might have tripped a flag with you, too.