From my experience politicians are much more uncomfortable being made fun of than they are being preached at and screeched at - you know and the soapbox routine. They're much more uneasy knowing they're a target of ridicule.
Straight couples don't have to be monogamous to be married or married to be monogamous. Monogamy no more defines marriage than the presence of children does. Monogamy isn't compulsory and its absence doesn't invalidate a marriage.