This recurring column was conceived as an explainer of sorts: a way to wade through the sea of headlines in what might as well be the epoch of “Big Brother: White House Edition” — and to come through to the other side with an understanding of how pop culture, power and politics influence one another. Comedian Samantha Bee expertly spins a tale of all three every week on her TV show, “Full Frontal,” so I figured: Why not ask her how she does it?