Eric Ostermeier provides data on the history of senetors seeking seventh terms.
If Lugar loses, he'll be only the second six-term senator in U.S. history to not win his party's nomination for a seventh term, according to researchers at the University of Minnesota. The other was Tennessee Democratic U.S. Sen. Kenneth McKellar, who lost a 1952 primary to U.S. Rep. Albert Gore Sr.
Northwest Indiana Times
May 5, 2012