Bulletin Today | PoliticsBy Ricardo Alonso-Zaldivar of The Associated Press WASHINGTON (AP) — Mitt Romney’s Medicare plan won’t try to control costs by limiting the payments that future retirees would use to buy private health insurance, aides say. Budget experts are questioning how the Republican candidate will be able to get savings without caps. Reining in costs is vital to keeping Medicare affordable, and in their plans both President Barack Obama and Romney’s running mate, Paul Ryan, set limits on the growth of …