Republicans and Democrats read a lot of the same news. What they do with it is a different question.

“(Almost) everything in moderation”? New research by Princeton’s Andy Guess finds that Democrats and Republicans read a lot of the same news sources; most American news consumers aren’t isolated in echo chambers, and most don’t read that much about politics anyway. The outliers with “the most polarized political media diets,” however, are more likely to vote in primary and general elections — and the fact that people are reading a lot of the same news doesn’t mean they’re not processing it (or sharing it) very differently.

Guess started out with...