I wrote in January (Bringing order to Web searching) about the search tool Clusty, noting its customizable tabs for searching news, images, shopping sites, blogs and other types of information. Now it has added a “Gov” tab, allowing users to search a number of special collections focused on U.S. government and politics. It combines a metasearch of FirstGov, MSN limited to the “.gov” domain, DefenseLink, political news from Reuters, AP and CNN, and a number of prominent American think tanks, including RAND, The Brookings Institution and The Cato Institute.

You can also use it to find senators and representatives. Type in a state name or postal abbreviation, and it will return the state’s senators, with their photographs, voting record, biography and a form to e-mail them. Type in a ZIP code to find a U.S. representative.