Rep. Peter J. Visclosky, Indiana Democrat, speaks in Merrillville, Ind., in January 2005. A federal grand jury has subpoenaed records of Mr. Visclosky in a criminal probe involving a top lobbying firm that specialized in funneling federal contracts to defense firms. (Associated Press)

Rep. Peter J. Visclosky, Indiana Democrat, speaks in Merrillville, Ind., in January 2005. A federal grand jury has subpoenaed records of Mr. Visclosky in a criminal probe involving a top lobbying firm that specialized in funneling federal contracts to defense firms. (Associated Press)