Washington — I’m a political fact-checker, which is usually an automatic conversation starter at parties. These days, I get two questions repeatedly: “Is it worse than it’s ever been?” and “What’s up with Donald Trump?”

I’ve been fact-checking since 2007, when The Tampa Bay Times founded PolitiFact as a new way to cover elections. We don’t check absolutely everything a candidate says, but focus on what catches our eye as significant, newsworthy or potentially influential. Our ratings are also not intended to be statistically representative but to show trends over time.

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.