The legislative branch of the United States government, as outlined by Article 1 of the Constitution, which establishes the two houses of Congress—the Senate and the House of Representatives.

In Senate history, there are 25 senators who served for more than 35 years.Senator Robert C. Byrd has the longest length of service with over 51 years.Keep in mind that there were 1,950 senators who have served in the entire 225 year Senate history.  This averages about eight years per senator.
Annotated by bacraig on June 26, 2014
William Paterson supported the idea of small states having equal representation.  In Paterson's New Jersey Plan, there was no description of how a new Congress would be composed, so he wished to preserve the representation found in the Articles of Confederation where one state got one vote in Congress.
Annotated by bacraig on June 13, 2014