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.
Wisconsin became just the second state in history (and first in 120 years) to host elections for the White House decided by less than one point in three out of five cycles.
The Badger State now has the highest rate in the nation of producing plurality-winning presidential candidates.
The nation’s third largest political party notched by far its most successful election cycle in races to the nation’s upper legislative chamber.
Republicans would break a party record if eight U.S. Senate nominees are elected from states voting Democratic for president.
The two Midwestern states have voted in unison in presidential elections nearly 90 percent of the time.
Democrats could pick off five of the 11 Republican-held seats held in Iowa, Minnesota, and Wisconsin (46 percent) – the second highest rate for the party in history.
Since 1972, 12 of the 27 Republican U.S. Senators to lose during presidential election cycles did so while the GOP White House nominee carried their state.