House passes bill designed to help veterans exposed to toxins during serviceWASHINGTON — The House voted 256-174 Thursday to pass a bill that would overhaul benefits for veterans exposed to toxic substances during their service, but the many differences with the Senate version of the measure raise questions about whether it has a chance of being enacted into law. The bill received support from 34 Republicans despite the criticism from most of their party members that it was too expensive. House Speaker Nancy Pelosi, D-Calif, scoffed at Republicans who refused to support the bill (HR 3967) spon…