Two thirds majority rule, aka Supermajority.
57 votes would have shy the minimum. Yes, it does sound wonky, but it gives them the chance to claim they were for the majority, but those >other party< managed to defeat it.
They're full of tricks like that. They used to vote themselves a payraise every year, until it became a hot topic with the public.
So they quietly passed a law that they get an automatic raise unless they vote against it, and never voted on payraises again.