Thirty-one of 175 specials conducted since 1913 have been held outside of November with just 22 during odd-numbered years.
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.
An average of seven senators have retired from the chamber each cycle during the past quarter-century; no incumbent up for reelection next year has yet closed the door on a 2018 bid.
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.
The Republican Party’s hold on every congressional seat could increase from nine to 12 states after the 2018 cycle.
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.
Up to 11 women could run for reelection to the chamber in two years; the chamber’s all-time record is just six.
The nation’s third largest political party notched by far its most successful election cycle in races to the nation’s upper legislative chamber.
Hoeven has now been elected by the #1 and #4 biggest margins in North Dakota U.S. Senate elections.