Bernie Sanders, an independent senator from Vermont, has announced that he’s challenging Hillary Clinton to be the Democratic Party’s nominee for president. So it’s time to return to the Candidate Evaluations series, where we examine a candidate’s background, policy history, and explicit statements in an attempt to figure out whether the candidate would actually be any good at being president. Too often, no one bothers to ask these questions, focusing instead on electability or likability. Previously, I’ve covered Ted Cruz, Rand Paul, Hillary Clinton, and Marco Rubio. None of them looked especially promising. Can Sanders do better?