Donald J. Trump’s record on truth and accuracy is astonishingly poor. So far, we’ve fact-checked more than 70 Trump statements and rated fully three-quarters of them as Mostly False, False or “Pants on Fire” (we reserve this last designation for a claim that is not only inaccurate but also ridiculous). We haven’t checked the former neurosurgeon Ben Carson as often as Mr. Trump, but by the percentages Mr. Carson actually fares worse.

Carly Fiorina, another candidate in the Republican race who’s never held elective office, does slightly better on the Truth-O-Meter (which I sometimes feel the need to remind people is not an actual scientific instrument): Half of the statements we’ve checked have proved Mostly False or worse.