BO, or at least some of his gang, know that raising the minimum wage would depress employment. But they deem it to be good politics, and that is what matters to them.
To BO and to progs in general, EVERYTHING IS POLITICS. So economics is politics (e.g., minimum wage), science is politics (e.g., AGW), etc., etc., etc., etc., ad infinitum.
Dr. Williams is 100% right in this article. But BO and his prog cronies don give a rat's patootie about economics. It's all politics; politics are all that matters.