Clusty's Gov tab brings together a number of special collections using Vivísimo Velocity. The Gov+ search is a powerful metasearch analogous to the Web+ tab, but focused on U.S. government and politics. It combines a metasearch of FirstGov, MSN limited to the ".gov" domain, DefenseLink, political news from Reuters, the Associated Press, and CNN, and a number of prominent American think tanks, including RAND, The Brookings Institution, and The Cato Institute.