Catherine Rampell: Sanderscare is all cheap politics and magic math

WASHINGTON -- For years Democrats have (rightfully) hammered Republicans for spouting empty slogans and magic math.Tax cuts will pay for themselves? Uh-huh, if you say so. Maybe have a chat with Kansas.Build a wall, and Mexico will pay for it? Hmm, that’s not what Mexico says.Repeal and replace Obamacare? Right-o, show us a replacement plan, any replacement plan, that won’t raise rates and cause millions of Americans to lose their insurance.These were hollow promises, with no serious