White House sources are telling Democratic reporters that the president is willing to go over the so-called “fiscal cliff” if GOP leaders don’t agree to his demand for higher tax rates on the wealthy without substantive spending cuts. A political deadlock would mean an automatic tax increase for middle-class and wealthy Americans on January 1, and the opportunity for Obama and the Democrats to push a tax-cutting bill for middle-class voters in 2013, say the White House officials, who leaked the claim to two liberal columnists. The first of two December 3 leaks came via the left-wing Mother Jones Magazine...