The Supreme Court has reaffirmed its backing for political donation limits in a case watched for any shift in court sentiment on the landmark 1976 Buckley v. Valeo decision. Justices decided six-to-three that a Missouri law capping contributions didn’t violate free speech rights. Meanwhile, in a five-to-four ruling dissenters say will perpetuate bias against minorities, justices limited federal authority to veto changes in state and local election laws. The Court, citing changes in Florida’s execution policy, pulled back from an earlier decision to rule on whether use of the electric chair should be prohibited.