For only the eighth time in history, but the fourth since 1989, the US Senate convicted a federal judge today on four articles of impeachment and disqualified him from ever holding federal office again. His defense was addiction to gambling. Thomas Porteous corrupted all those around him, according to California Democrat Adam Schiff, impeachment manager in the Congress. The New Orleans judge was nominated to the federal bench in 1994 by another Democrat, Bill Clinton. Bruce Albert is Washington reporter for the New Orleans Times-Picayune.