John Perdue of West Virginia joins a half-dozen other officeholders who are currently surrounded by state executive officials from the opposing political party.
The progressive senator would be the first major party White House hopeful from the Beaver State in the modern primary era.
Jerry Brown is poised to end up #3 on the all-time list of statehood gubernatorial service.
If a handful of toss-up races all end up in the Democratic column, the party will have its strongest showing in races for governor since its formation nearly 190 years ago.
After the 2016 cycle, the party could reach record winning streaks for governor in five states across three regions of the country.
Indiana Governor Mike Pence’s name may be added to a very short list of failed vice-presidential nominees who gave up their seats along the way.
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.
Presumptive GOP nominees have averaged more than 75 percent of the primary vote after their main challengers have exited the race.
Five states (plus two yet to vote) will keep their perfect records intact for backing the eventual Republican nominee in the modern primary era; two states lost their bellwether status this cycle.
Eight U.S. Senators went against the majority of their party during the controversial 1987 Robert Bork confirmation vote; seven of their seats have since flipped for good in subsequent elections.