Class I U.S. Senators
The Senators whose terms expire in January of 2007 are called "class I" Senators, and all 33 of them are listed here.
Democratic Senate Campaign Committee: State By Sta
Clickable map shows which party will be defending US Senate seats in 2006, courtesy of the national offices of the Democratic Party.
Democratic Senatorial Campaign Committee
Campaign headquarters for the Senate Democrats.
Modern Vertebrate - 2006 U.S. Senate Races
Information and predictions regarding upcoming US Senate elections.
National Republican Senatorial Committee
Campaign headquarters for the Senate Republicans.
National Republican Senatorial Committee: Senate R
Clickable map shows which party will be defending US Senate seats in 2006, courtesy of the national offices of the Republican Party
Our Campaigns - U.S. Senate
List of incumbent US Senators, with electoral information for each.
Politics1 - State & Congressional Candidates,
A state-by-state listing of all U.S. Senate candidates and other candidates throughout the United States, including links to candidate web sites
Senate Election Law Guidebook
Senate guidebook describing pertinent federal laws regarding how to run for the U.S. Senate.
Senate Races of 2006 at Johnny Z's
The likely fate of incumbent US Senators is assessed.
Senators up for Re-election in 2006
The Council for a Livable World surveys the 2006 US Senate campaign landscape.