US election data · Long Odds, part five
Not a safe seat, and not a swing driven by a damaged favorite — just close. The twenty tightest US House general elections of 2018–22, and six of them researched in depth: what actually decided a race that was, by any reasonable measure, a coin flip.
Every contested, non-unopposed House general election from Safe Seats’ own dataset, sorted by margin. The same “Razor’s edge” band described on How Close Is Close, at its sharpest end.
| Seat | Winner | Party | Margin |
|---|---|---|---|
| IA-2 2020 | Miller-Meeks, Mariannette | R | +0.00 |
| NY-22 2020 | Tenney, Claudia | R | +0.03 |
| GA-7 2018 | Woodall, Rob | R | +0.15 |
| CO-3 2022 | Boebert, Lauren | R | +0.17 |
| UT-4 2018 | McAdams, Ben | D | +0.26 |
| NC-9 2018 | Harris, Mark | R | +0.32 |
| NY-27 2018 | Collins, Christopher C. | R | +0.38 |
| TX-23 2018 | Hurd, Will | R | +0.44 |
| MN-1 2018 | Hagedorn, Jim | R | +0.45 |
| MI-10 2022 | James, John | R | +0.49 |
| NY-17 2022 | Lawler, Michael V. | R | +0.64 |
| CO-8 2022 | Caraveo, Yadira | D | +0.69 |
| IA-3 2022 | Nunn, Zach | R | +0.69 |
| NM-2 2022 | Vasquez, Gabriel | D | +0.70 |
| IL-13 2018 | Davis, Rodney | R | +0.76 |
| CT-5 2022 | Hayes, Jahana | D | +0.79 |
| KS-2 2018 | Watkins, Steve | R | +0.85 |
| AZ-1 2022 | Schweikert, David | R | +0.88 |
| NY-22 2022 | Williams, Brandon M. | R | +0.98 |
| UT-4 2020 | Owens, Burgess | R | +1.0 |
What actually decided a margin this small was rarely a tactic in the usual sense. One turned on an election-administration failure serious enough to draw a federal lawsuit. One turned on a felony indictment absorbing almost exactly the margin a 40-point registration advantage could spare. One turned on the head of the other party’s own campaign committee neglecting his own district. Read plainly, that is the honest finding: at the scale of a true coin flip, the causes are not glamorous.
The closest US House race in a century. An initial count showed Miller-Meeks ahead by 47 votes; a recount Hart herself requested narrowed it to 6.
“state-certified as the winner over Democrat Rita Hart on November 30 by an extremely narrow margin of 6 votes.”Wikipedia, 2020 US House elections in Iowa
“Hart announced that she would contest the election with the House Administration Committee under the 1969 Federal Contested Elections Act.”Not a campaign tactic but a post-election one, and it backfired: Hart asked the Democratic-controlled House itself to overturn a certified state result rather than pursue it through Iowa's courts, drew bipartisan criticism, and withdrew four months later having gained nothing.
Wikipedia, 2020 US House elections in Iowa
A rematch: Brindisi had beaten Tenney by under 1 point in 2018. The 2020 count dragged three months past election day.
“Tenney was declared the winner on February 5 by 109 votes, or 0.03 percent of the vote. Brindisi conceded three days later, and Tenney was sworn in on February 11.”Wikipedia, 2020 NY-22 election
“Both commissioners of the Oneida County Board of Elections were forced to resign. The federal Department of Justice later sued the county over its error”The deciding factor in the closest House race of the cycle was administrative, not strategic: a county elections board mishandled the count badly enough to draw a federal lawsuit.
Wikipedia, 2020 NY-22 election
A Democrat challenging a two-term Republican incumbent in a district Mitt Romney had carried by 37 points six years earlier.
“McAdams would end up defeating Love by 694 votes.”Wikipedia, 2018 US House election in Utah, District 4
“McAdams' campaign emphasized his "proven track record of working across party lines and getting something done on important issues."”A moderate Democrat ran on bipartisan competence rather than national party themes, in the one Utah district where that framing had any chance at all.
Wikipedia, 2018 US House election in Utah, District 4
Collins had won his previous two elections by more than 40 points. He was indicted for insider trading three months before the vote, suspended his campaign, then restarted it after Republicans failed to get him off the ballot in time.
“Rep. Chris Collins, the New York congressman who tirelessly promoted an Australian biotech company and who now faces charges of insider trading related to the firm”Collins pleaded guilty in October 2019, resigned the day before, and was sentenced to 26 months. He had denied wrongdoing throughout the 2018 campaign.
STAT News
“Chris Collins, 140,146, 49.1%; Nate McMurray, 139,059, 48.8%”A 1,087-vote, 0.3-point margin. The tactic was arithmetic, not strategic: a 40-point registration advantage in a district that had not elected a Democrat in decades absorbed almost the entire cost of an active federal indictment, and still barely covered it.
Wikipedia, 2018 US House elections in New York
Maloney chaired the Democrats' own campaign committee. After redistricting, he chose to run in a different, supposedly safer district already held by a fellow Democrat rather than his own redrawn seat.
“Lawler narrowly defeated Maloney in the general election in an upset. Lawler's victory marked "the first general election defeat for a campaign chair of either party since 1980".”Wikipedia, Sean Patrick Maloney
“he eventually rushed back to his own district for last-minute campaigning once he realized that Republican Assemblyman Mike Lawler might defeat him”The head of the party's own House campaign operation spent 2022 campaigning for colleagues elsewhere and nearly lost his own seat for it. City & State: "Jones was forced to make a choice with no great options. Run a primary against Maloney – powerful, experienced, with tons of money."
Wikipedia, Sean Patrick Maloney
A newly redrawn district, previously Republican-leaning, against a sitting Republican incumbent. National Democrats made it a top recruiting priority.
“He won on November 8, 2022, by 1,350 votes, defeating Republican incumbent Yvette Herrell. The district's boundaries were redrawn after the 2020 census, drawing the previously Republican-leaning district to be Democratic-leaning.”Wikipedia, Gabe Vasquez
“Vasquez deleted tweets critical of the oil and gas industry, rationalizing rioting in the summer of 2020, and comparing the Trump administration to the Ku Klux Klan.”A candidate in a genuine swing district moderated his own public record mid-campaign rather than run on it.
Wikipedia, Gabe Vasquez
This is six cases, chosen because they were both extremely close and well documented — the same coverage-bias caveat phase 1 measured directly applies here too. It is not a claim that tactics never matter in a tight race, only that in these six, something else decided it first: an uncounted ballot, a resignation deadline missed by weeks, a candidate who assumed his own seat was safe enough to leave. A genuinely tight race is, definitionally, one where the ordinary determinants were already balanced — which is exactly why an unglamorous, non-strategic factor gets to be the deciding one.
The census is computed from the same FEC workbooks Safe Seats parses. Each case is cited to the source on its own card, fetched 2026-09-21. Parts one through four of this research are at Long Odds, Safe Seats and Against the Lean.
Built 2026-09-21 from data/tight_races/tight_races.json by
src/tight_races.py. Phase 5 of the upsets research.