President Barack Obama called on Republican lawmakers Saturday to approve billions of dollars in new spending to avert a scheduled 21 percent cut in payments to doctors who treat Medicare patients. If Republican senators don't allow the stalled proposal to pass, some doctors will stop treating Medicare recipients, Obama said in his weekly radio and Internet address. He noted that since 2003, Congresses led by Democrats and by Republicans alike have blocked similar proposed cuts in doctors' reimbursement rates. But now, he said, Republicans are "willing to walk away from the needs of our doctors and our seniors." The so-called...