Last week New York Times video journalist Johnny Harris asked a simple question.

"What do Democrats actually do when they have all the power?"

It turns out that 18 states in the US are effectively run by Democrats, who control both the executive and legislative branches. As Harris notes, Democratic leaders tend to blame Republicans for foiling their progressive plans, but that's hardly the case in these 18 states where Republicans stand well away from the levers of power.

To answer his question—what do Democrats do when they have power?—Harris teamed up with Binyamin Appelbaum, the lead writer on business and economics on the Times editorial board and author of The Economists' Hour.

What they found may surprise you.