WASHINGTON (Reuters) - U.S. Roman Catholic bishops stepped up their battle against President Obama's contraceptives policy on Friday by urging Congress to use its fiscal debate to free religious employers from a mandate requiring insurance coverage for birth control. In a letter to all 535 members of Congress, Archbishop William Lori of Baltimore suggested two provisions to extend existing federal conscience protections to the contraceptives mandate and strengthen the ability of opponents to seek vindication in federal court. ...