Decision Desk HQ has called Arizona's 6th Congressional District for Democrat JoAnna Mendoza, the retired Marine who challenged two-term Republican Representative Juan Ciscomani in southern Arizona — but readers should know exactly who has called what: as of Wednesday evening the Associated Press still listed the race as “too early to call,” even though its own count put Mendoza ahead by 24,962 votes with an estimated 83.6 percent of the vote in. Mendoza declared victory at her Tucson watch party on election night, and every published count since has kept her comfortably in front.
The counts differ by snapshot, as Arizona counts always do, but they all point the same way. Decision Desk HQ's own results page, updated at 5:17 p.m. Eastern on Wednesday, showed Mendoza on 157,496 votes (52.86 percent) to Ciscomani's 134,306 (45.07 percent), out of 297,968 votes counted. The Arizona Secretary of State's early returns, relayed by Blog for Arizona, showed Mendoza on 157,269 to Ciscomani's 133,502. On Wednesday morning the wire-style roundup carried by the Wyoming Tribune Eagle and other papers put her advantage at 23,767 votes and noted that no national media outlet had yet called the race, while Decision Desk HQ had. Tucson Agenda's election-night tally had her at 52.9 percent to Ciscomani's 44.9 percent.
The district, and the geography of her lead
The 6th District covers portions of Tucson and southeastern Arizona, extending into Pinal County — in practice a map of Pima County's eastern suburbs, Cochise County on the Mexican border, and Graham and Greenlee counties to the east. Decision Desk HQ's county breakdown shows how she did it: Mendoza carried Pima County, the district's population centre, by about 16.5 points on more than 224,000 votes, a margin large enough to outweigh Ciscomani's strong showings in Cochise County, where he led by about 25 points, and in Graham County. The district includes Fort Huachuca and the border communities of Cochise County, Davis-Monthan Air Force Base's orbit in Tucson, and the Interstate 10 corridor that carries much of Arizona's freight east toward New Mexico and Texas.
A first since the 1990s — and, her supporters say, a first ever
A Mendoza win puts a Democrat in charge of this southern Arizona seat for the first time since Karan English held it from 1993 to 1995, the Wyoming Tribune Eagle roundup noted; Republicans have held the seat in its recent form since Ciscomani won it in 2022 and took office in January 2023. VoteVets, the veterans' political group, celebrated her as the daughter of a farmworker who has become the first female Marine elected to Congress — a claim made by her supporters about a genuine first, given how few women Marines have run for the House. She is a retired Marine Corps veteran who served in Iraq and Afghanistan, according to her campaign biography.
What the winner and the incumbent said
Mendoza claimed victory in front of supporters at a Tucson watch party on election night, Tucson Agenda reported, as returns showed her leading by about eight points. Ciscomani, addressing his own supporters as the first returns arrived, was careful not to concede: “It's gonna take a few days probably for this to get called,” he said, according to the Arizona Daily Star, quoted by the Arizona Globe. Former Congresswoman Gabrielle Giffords, whose GIFFORDS PAC endorsed Mendoza in August 2025 and rallied with her in Tucson in the final days, congratulated her in a statement published by the Gila Herald: “I am thrilled that Arizonans have made their voices heard and will be sending my friend and a true gun safety champion, JoAnna Mendoza, to Washington… she will fight every day for a safer future for our state.” Giffords herself represented a similar Tucson-area district from 2007 to 2012.
How the race was rated, and how she won it
The 6th was one of the most closely watched House races in the country. The Cook Political Report shifted it from “Toss Up” to “Lean Democrat” in Mendoza's favour on October 23, noting that President Trump had carried the district by only a point in 2024 and was proving “a heavy anchor” on Ciscomani, while Sabato's Crystal Ball kept it a toss-up. The last reported poll, taken October 26, gave Mendoza a 3-point lead, 47 percent to 44 percent. Her campaign said she outraised the incumbent by more than two to one in the third quarter. In the end the margin was not close: a lead in the mid-20,000s of votes, built on Pima County, in a district the president's party had expected its two-term incumbent to defend.
Part of an Arizona sweep
Mendoza's result was part of a near-total Democratic sweep of Arizona's congressional delegation this cycle, the Gila Herald noted, on a night when Democrats won control of both chambers of Congress nationally. In southern Arizona, Democratic Representative Adelita Grijalva easily secured her first full term in the neighbouring 7th District with about 71.5 percent of the vote, Tucson Spotlight reported, and Governor Katie Hobbs won a second term. Tucson Spotlight, citing unofficial results, reported Democrats also took control of the state House and Senate for the first time in 60 years — a state-level shift that, if it holds through certification, changes who writes Arizona's laws on water, elections and the border for the next two years.
Why Tucson matters beyond Tucson
Arizona's 6th is a border-and-bases district: immigration enforcement, veterans' healthcare and Colorado River water all run through a representative's in-tray here, and all three affect the state's growing South Asian community and the Punjabi truckers who run Interstate 10 through Tucson and Pinal County. A Marine veteran who campaigned as a gun-safety champion with Gabrielle Giffords at her side will vote on all of it in a Democratic House — a very different brief from the one Ciscomani, a Republican who sat in the majority, carried for two terms.
Arizona keeps counting: Tucson Sentinel reporting cited on Wednesday said about 80,000 ballots remained to be counted in Pima County alone, and Arizona's provisional-ballot process usually takes about a week. The AP call, certification and any concession from Ciscomani are still to come; Mendoza's lead — roughly 25,000 votes in the AP count — is far larger than the remaining-ballot swings Arizona races usually produce, which is why Decision Desk HQ called it on election night. The new Congress is sworn in in January 2027.
Sources: Associated Press election results for Arizona's 6th District (race listed as too early to call; Mendoza 163,197, Ciscomani 138,235, 83.47% of precincts reporting); Decision Desk HQ results page for AZ-06 (call at 10:12 p.m. ET, Nov. 3; 157,496 to 134,306 at 5:17 p.m. ET, Nov. 4); Tucson Agenda, November 4, 2026; Gila Herald, November 4, 2026 (GIFFORDS PAC statement); Wyoming Tribune Eagle wire roundup, November 4, 2026; Arizona Globe and Blog for Arizona (Secretary of State early returns). All vote figures are unofficial.