Krugman: Obama can't back down in the battles ahead
                                
                                
                                    (Newser) -
                                    Democrats arguably won a "tactical victory" with the zero-hour fiscal cliff tax compromise, Paul Krugman writes in the  New York Times . The deal, after all, reduced income inequality, extended unemployment and some other progressive policies, and, best of all, didn't cut entitlements, which "was by no means...