Expressing concern that the United Nations' efforts to stem international gun running could impede the rights of U.S. gun owners, Sen. David Vitter, R-La., is proposing legislation to bar financing for the world organization should it infringe on Americans' Second Amendment rights. Critics of Vitter's bill, including Eric Howard of the Brady Campaign to Prevent Gun Violence, accuse the freshman senator of placating voters who oppose gun control and are cynical about the United Nations. Howard said the bill could torpedo international efforts to stem the flow of arms to brutal militias in Africa and elsewhere that target civilians, particularly...