For Rep. Mike Pompeo, now CIA Director, thumped his 3 U.S. House opponents by an average margin of 31.5 percentage points. Republican Ron Estes defeated Democrat James Thompson by 6.8 percentage points.
Republicans keep Kansas House seat in special election. (CNN, 4/12/2017)
The seat was considered to be by Republicans a straight win -- until an energized Democratic base left Estes with a smaller advantage.
5/25/2017 update, " GOP loses longtime red seat in New Hampshire House of Representatives", starts here.
Source: Ballotpedia (2012, 2014, 2016)
NH House special elections: Democrat pulls off upset in Wolfeboro, Republican wins Hillsborough County seat. (WMUR, 5/24/2017)
Wolfeboro Town Clerk Patricia Waterman said DesMarais was the first Democrat elected to the New Hampshire House from that town since 1913.
Original 5/24/2017 post, "Cue the Dragnet theme for Donald Trump and the Republicans", starts here.
New York Democrats See Special Election Assembly Win as Good Sign for ’18. (The New York Times, 5/24/2017)
Well, yeah! Ms. Pellegrino defeated her Republican opponent, Tom Gargiulo, in the 9th Assembly District on Long Island, 58 percent to 42 percent, despite the district being heavily Republican and President Trump winning it with 60 percent of the vote.
The Massapequa Patch published preliminary tallies.
Source: State of New York