“There’s a saying in politics that personnel is policy,” Matt Gertz, a senior fellow at Media Matters, said on a recent afternoon. “The people who surround principals in the political world can have a lot of influence.” Gertz, 34, is best known for tracking Donald Trump’s Twitter account for clues about his well-reported habit of watching Fox News. On Twitter and via a Media Matters video archive, Gertz flags when Trump’s posts seem tied directly to programming—on Fox & Friends, Hannity and Lou Dobbs Tonight.
