Prognosticators are split as to the vulnerability of this GOP-held seat, but there is no denying a win by the state senator would be a political earthquake in deep red South Dakota.
Independent Joe Trillo could make Rhode Island the first state in 75+ years to have non-major party gubernatorial candidates win 20+ percent in three consecutive cycles.
Nine state delegations currently have junior senators who are older than its senior senator.
Noem is the fourth woman to land on the GOP primary ballot for governor in the Mount Rushmore State.
In the direct election era, parties in the midst of nine-election winning streaks have gone on to win a 10th consecutive contest in 42 of 47 attempts.
More than 30 percent of the three-dozen men and women to serve in the U.S. House from the Mount Rushmore State did so for only one term.
No sitting member of the U.S. House from South Dakota has ever appeared on a gubernatorial primary or general election ballot; just two ex-U.S. Representatives ever ran for the office.
Since the passage of the 17th Amendment all but seven states have been represented by a single party in the U.S. House and Senate for at least one Congress.
Kasich, Cruz, and Carson received the most votes as former White House hopefuls; 10 GOPers won more votes as ex-candidates than when they were still in the race.
Two states usually forgotten at the end of the primary calendar were treated to their most competitive Democratic primaries in state history.