It’s a joke. Jokes work by setting up an expectation, then subverting it. “Why did the chicken cross the road?” You think it might to be get bugs or run away from a fox, but the answer is “to get to the other side”. This joke works the same way. You think it’s going to be able a common want or need that spans sexual orientations, but it has to do with night coming after the day.

Also, the politician is a humorless fuck head and is being trolled.

Exactly!