You Did What With Who . . . And Who Is That Guy Anyway?

Which is the salient detail of this story — that a man had an affair with someone who is “mentally challenged,” that said man is active in conservative politics or that Sopranos extras seem to get into a ton of trouble? Hard to say:

A Queens man active in conservative politics was arrested yesterday for punching out a former friend in a fight that stemmed from an affair the man had with his ex-pal’s mentally challenged cousin, police and friends said.

Gerard Borriello, 48, of Rosedale, was charged with third-degree assault and released with a desk appearance after the scuffle outside the “Second to None” bar in Franklin Square, L.I., according to Nassau County police.

The slugfest left Jerry Russo — who claims to have a bit part in an upcoming “Sopranos” episode — with a broken nose.