On Tuesday, Maine voters will do something never done before in the country on this scale: Instead of voting for one candidate in the race for governor, they’ll rank their choices from first to last. It’s a totally new way of electing politicians in America, one pitched by advocates as the single most transformative way to inject collegiality into today’s hyperpartisan political climate. And if it works, Maine could be a guide for other states to do the same. Here’s how it works: