United States Senate | Senate | New York State Senate | New Jersey Senate | Minnesota Senate | Louisiana State Senate | Leader of the Opposition | California State Senate | Senate of Canada | United States Senate Committee on the Judiciary | United States Senate elections, 2004 | Florida Senate | Australian Senate | Wisconsin State Senate | United States Senate Committee on Appropriations | North Carolina Senate | Leader of the Opposition (Western Australia) | Roman Senate | Oregon State Senate | United States Senate Committee on Foreign Relations | Senate of the Philippines | Leader of the House of Commons | President of the Senate | Massachusetts Senate | United States Senate elections, 2000 | President pro tempore of the United States Senate | Opposition to the U.S. involvement in the Vietnam War | Majority Leader of the New York State Senate | Leader of the House of Lords | Illinois Senate |
On February 1, 2006, he was named as the Leader of the Opposition in the Senate, replacing Noël Kinsella, a position he held until being succeeded by Céline Hervieux-Payette on January 18, 2007.