WASHINGTON (AP) - In a blow to the landmark agreement among the nation's largest gun maker, the Clinton administration and hundreds of communities, the House voted Wednesday to bar the federal government from helping to attract more municipalities to the pact. By a 218-207 vote, the House voted to prevent the government from spending any money for the Communities for Safer Guns Coalition. In return for Smith & Wesson's promise to use gun-safety devices and sales practices, the 411 localities that have so far joined the coalition have agreed to make the company's firearms the preferred gun for their law enforcement agencies. Minutes later, the House muddled its message by voting 219-206 to reject a second provision that would have forbidden the federal government outright from enforcing the March 17 agreement between Smith & Wesson and the federal and local governments.