Politics: The president had hardly put down his pen after signing the tax cut Wednesday when class warfare broke out again. As usual, the demagoguery doesn't comport with reality.According to the Center on Budget and Policy Priorities, a hard-left Washington think tank, many families whose yearly incomes are between $10,500 and $26,625 — a number that's nearly 12 million — won't be getting the additional $400 per-child tax credit that was part of the tax cut.While we're not challenging the findings, we object to the misleading nature of the argument. A significant fact is being left out.The Tax Foundation tells...