Only five of 55 U.S. Senate partisan winning streaks of eight in a row have been halted in the subsequent contest during direct election era.
Mary Jo Walters will attempt to achieve what no primary challenger has accomplished against a sitting Democratic Wisconsin U.S. Senator: win even 15 percent of the primary vote.
John Perdue of West Virginia joins a half-dozen other officeholders who are currently surrounded by state executive officials from the opposing political party.
Only three times in Badger State history have two sitting statewide officials squared off in a race for governor.
Only one of the 73 Republican U.S. House members from Trump states with Democratic US Senators on the 2018 ballot has mounted a challenge.
The 10 Trump states with Democratic incumbents have voted for senate nominees from the opposing party of the sitting president 62 percent of the time over the last 50 years.
Herb Kohl’s nephew is seeking to become the first Badger State U.S. Representative since the 19th Century to be preceded by a relative in the chamber.
Governors seeking their third consecutive four-year term have won nine elections in a row since 1994 and 20 of 24 dating back to 1970.
At least one first-term incumbent has been defeated in 48 of the 52 election cycles during the direct election era.
Heller is the only Republican among the 15 U.S. Senators who serve states in which their party holds a minority of U.S. House seats; a dozen (including Heller) are up for reelection in 2018.