Kamala Harris Still Has Time for a Big New Idea in Economic Policy

In typical campaigns, presidential hopefuls and their staffs spend a year or so researching, debating, testing, and messaging new policy ideas. I know because I’ve helped develop economic policy for five Democratic presidential candidates. It can make a real difference if the campaign correctly identifies an issue that moves voters who otherwise might stay home or even support the other side.

This process or something much like it produced two of Donald Trump’s economic planks this year—the...