As I typically do when writing about polls, I’ll begin this piece with a nod to the obvious: Polls aren’t gospel. They’re little snapshots of a moment in time, and they’re only as “accurate” as their methodology permits. Still, when you avoid cherry-picking and, instead, look at them as a whole, they can represent trends and that intangible thing — momentum — which so often seems to play a role in the outcomes of electoral contests (and, of course, sporting events).