Teamsters Election Investigation --NPR's Brian Naylor reports on the latest in the Congressional investigation of the 1996 Teamster's Union election. A federal monitor ruled Ron Carey's victory over James Hoffa invalid...after finding that Carey used union funds in the race. A House subcommittee has subpoenaed five groups, including the Democratic National Committee, the Teamster's Union and Carey's campaign. Critics say the investigation has made little progress and needs to narrow its focus. The Congressional panel wants to find out why the election was fraudulent...since the U-S government spent 20 million dollars to oversee it.