While four Senators file from addresses inside the beltway, one Midwesterner files from his hometown, population 373.
It has been 96 years since the last time a major party did not field a candidate in eight or more U.S. Senate races.
Only one of 14 U.S. Senate Minority Leaders in history have been defeated at the ballot box while no Senate party floor leader has ever lost when his party has netted seats in the chamber.
Two fewer U.S. Senators are dying in office per year on average over the past half-century than during the previous 60 years.