Congressional Universe - http://www.kcls.org/erout/goto.cfm?f=conguniv&d=22
Congressional documents, records and unclassified congressional documentation via the CIS/Index to Publications of the United States Congress.
Constitution of the United States - http://www.archives.gov/historical-docs/document.html?doc=3&title.raw=Constitution%20of%20the%20Unit
Includes scanned images of the original documents and biographies of the delegates who signed the Constitution.
Core Documents of U.S. Democracy - http://www.gpoaccess.gov/coredocs.html
GPO access to the Constitution, Articles of Confederation, Presidential Proclamations, the Gettysburg Address and other core documents.
The Charters of Freedom (National Archives) - http://www.archives.gov/exhibits/charters/
Full text of the Declaration of Independence, the Constitution and the Bill of Rights, including scanned images of the original documents and biographies of the Founding Fathers.