Mitt Romney’s pick of U.S. Rep. Paul Ryan as his running mate has rekindled a heated debate over Medicare. Ryan, R-Wis., is the head of the Budget Committee in the U.S. House of Representatives and the architect of a plan to dramatically restructure Medicare. Today, Medicare operates as a government-run health insurance plan for Americans over age 65. Ryan’s idea is to eventually move Medicare toward private insurance companies by giving people a set amount to buy their own health insurance plans. The new system would be for people who ...