Voters have elected Republican Trent Franks to a sixth term.
Cronkite News bases its projection on unofficial returns showing Franks winning by a wide margin in the 8th Congressional District, which covers suburbs north and west of Phoenix.
Franks faced Democrat Gene Scharer, a former teacher and truck driver, and third-party candidate Stephen Dolgos, an insurance agent.
Franks ran in a district redrawn according to the 2010 Census but still heavily Republican.
His accomplishments in Congress include helping bring the new F-35 fighter Luke Air Force Base.