Single-issue presidential campaigns are not generally successful, but what if the issue in question is the survival of most life on Planet Earth?
That's what Washington governor Jay Inslee wants us to consider as we choose the next president, and he's making climate change the centerpiece of the candidacy he announced on Friday. He's also the first governor to enter the 2020 race, joining an extraordinarily diverse and growing field.
Unlike many (but not all) of his primary opponents, Inslee has a direct and emphatic answer to the question every one of them has to face: Why are you running for president?