In one out of every three cycles for the past century the Wolverine State has split its vote for governor and U.S. Senator.
Prior to Hall's runoff loss, 256 straight incumbent Republican U.S. House members from the Lone Star State had launched successful renomination campaigns since 1870.
Second-place primary finishers have won 16 of 35 Texas Republican U.S. House runoffs since 1992; Hall might become just the second Texas GOP U.S. Representative to lose his party's nomination in history.
Only one of eight run-off bound first place primary finishers in a Georgia U.S. Senate race went on to win the seat; Perdue is also coming off the lowest ever first place finish by either party in Georgia U.S. Senate primary history.
Idaho U.S. Representatives have now won 34 renomination bids in a row since 1976 and 83 of 84 dating back to 1918.
McConnell wins the lowest percentage of the primary vote among the last 22 Kentucky U.S. Senators vying for a renomination bid dating back to 1938.
No female Democratic candidate for governor in Pennsylvania has eclipsed the 20 percent mark in a primary to date; only seven of 165 Democratic and GOP primary candidates in state history have been women.
The number of women in the chamber has remained stable or increased in every cycle since the late 1970s.
A historically competitive primary field finds Ricketts emerging with the lowest winning percentage and third narrowest victory margin on record in a Cornhusker State GOP gubernatorial race.
Eighty percent of gubernatorial nominees from the sitting president's party have been victorious in his home state over the last century.
Three cabinet secretaries under President Obama have already recorded the longest tenures as heads of their respective departments.
Incumbent U.S. Representatives from the Tar Heel State running for reelection have launched 299 consecutive successful renomination bids since 1958.
A record number of GOP U.S. Senate candidates could drag Thom Tillis into the party's second runoff in history; the last five North Carolina Democratic and GOP run-off victors lost the general election.
This cycle finds the Mount Rushmore State equaling historical marks for the most U.S. Senate candidates qualifying for the ballot as well as the most Republicans (or candidates from any party) in a primary race.
It has been more than 80 years since South Dakotans had so many candidates from which to choose in a U.S. Senate election.