The Working Families Party put out a set of robo-calls over the weekend denouncing Eva Moskowitz for her stance on an anti-sweatshop bill.

You can hear a garbled version — they seem to have had tech problems — of the call here.

Eva has fired back with a letter accusing Scott Stringer of playing dirty and the WFP of violating campaign finance rules, but the real amusement of the flap is what this is about: they’re not accusing her of voting against the bill.

Eva, in fact, voted for the bill. Twice. What she’s being accused of — gasp! — is failing to co-sponsor it.

“Eva Moskowitz: wrong for working families,” is the tag line on the call.

Sometimes you get the sense that the margin for dissent in this town can be rather narrow.