Senate:
http://www.senate.gov/

House of Representatives:
http://www.house.gov/

White House:
www.whitehouse.gov

Executive Branch Website Listings:
http://lcweb.loc.gov/global/executive/fed.html

Judicial Branch Website Listings:
http://lcweb.loc.gov/global/judiciary.html

THOMAS Legislative Information Site:
http://thomas.loc.gov

Library of Congress:
www.loc.gov

State and Local Government Website Resources:
http://lcweb.loc.gov/global/state/stategov.html