 Which is why the category of questions that should not be asked tonight all begin with some variation of, that's not true, Mr. President. Or are you saying, Mr. President, that this or that isn't true? In other words, I don't want fact-checking in here. Fact-checking has no place during a presidential debate. Fact-checking by the moderators tonight or other moderators later in this cycle is anathema to productive debates. Especially when they're only 90 minutes long.