Incumbent Democrat Tom O'Halleran has defeated Republican challenger Wendy Rogers in Arizona's 1st Congressional District, the Associated Press declared Wednesday.
District 1 was Arizona's last seat to be called, and it decided a 4-4 split in the state's delegation heading to Washington. Like Arizona, the U.S. House of Representatives will be a Democratic majority.
Joining O'Halleran on the Democratic side are Ann Kirkpatrick (CD 2), Raul Grijalva (CD 3), Ruben Gallego (CD 7) and Greg Stanton (CD 9).
The all-incumbent Republican group headed to the House is made up of Paul Gosar (CD 4), Andy Biggs (CD 5), David Schweikert (CD 6) and Debbie Lesko (CD 8).
Lesko won a special election earlier this year in District 8 and Stanton, a former Phoenix mayor, rode name recognition to a win in his first federal race.
The last time Arizona elected more Democrats than Republicans to the House of Representatives was 2012, when Kirkpatrick (in CD 1) and Grijalva were joined by Ron Barber (CD 2), Ed Pastor (CD 7) and Kyrsten Sinema (CD 9).
Arizona's U.S. Senate race has not yet been called, but Republican Martha McSally leads Sinema by about 12,000 votes as of Wednesday afternoon. If she wins, both of Arizona's U.S. Senators would be Republican, as Sen. Jon Kyl was appointed to fill Sen. John McCain's seat after his August death.