Chris Grayling has been castigated for using dodgy statistics to back up the false claim that violent crime has increased.
But the latest Tory balls-up in trying to stand up the "broken society" scaremongering may be the most embarassing yet.
The Tories claim 54% of girls under 18 in deprived areas get pregnant.
In the real world, that would be 5.4%.
5.4%? 54%? To complain is to miss the point too. The main point is that society is broken, I tell you, broken. How could it be doubted? Don't you read the newspapers?
As The Economist pointed out, teenage pregnancy has been falling for years. "A girl aged between 15 and 19 today is about half as likely to have a baby in her teens as her grandmother was".
But that counter-intuitive fact can't compete with what the Tories "know" is going on. Perhaps that is why they were trumpeting off about their eye-catching stat without even checking it. As James Forsyth, Spectator political editor, astutely points out, the real damage is not a matter of arithmetic:
The Tories are facing embarrassment tonight after a document they released claim that 54 percent of young women under 18 in poor areas get pregnant when the actual number is 5.4 percent. It is easy to see how a mistake like this is made but it is still damaging and made more so by the fact that it gives Labour the opportunity to claim, as they are doing tonight, that the mistake shows that the Tories have no idea how the country actually lives.
UPDATE: LabourList have helpfully linked the Tory document.
The Tories are not just once again enormously out of touch with reality in the most deprived areas of Britain - remember Chris Grayling's "in many parts of British cities, The Wire has become a part of real life in this country" - but everywhere else too.
The report also claims that 19% of girls under 18 get pregnant in the most affluent areas of Britain. (That's 1.9%, or 19 in a 1000). Forsyth is most generous in calling this an easy mistake to make for a party claiming it is ready to govern.
In this fantasy Britain, there would be six pregnancies in every school class of 30 young women in, say, Witney, Oxfordshire, as against sixteen in a similar class in Moss Side, Manchester.
The Conservatives truly are living in a Dacre nightmareland.