Footnote: Mouse-over for full source
US Senate: Freshman from 1939-2003 identified from "A Chronological Listing of U.S. Senators, http://www.senate.gov/artandhistory/history/common/briefing/senators_chronological.htm. Last Accessed 7 Oct 2009. Data from 2003-2009 from http://en.wikipedia.org/wiki/List_of_freshman_class_members_of_the_111th_United_States_Congress#House_of_Representatives Last accessed 4 September 2010. Data for 2010 from http://elections.sos.state.tx.us/elchist.exe Last accessed 4 January 2011.