This afternoon, the "May 12 Coalition" will take to the streets of Lower Manhattan with a demand for Mayor Bloomberg: "Make Big Banks and Millionaires Pay." But we'd all pay: The coalition's plan centers on a massive tax hike that would send jobs and wealth away from the five boroughs. The group comprises the usual suspects -- the United Federation of Teachers, the Transport Workers Union, the big health-care unions, the Coalition for the Homeless, etc. No surprise: People who depend on big government want bigger government. The $49.7 billion that Bloomberg will spend next year -- up 11.2 percent...