Arizona elections: What you need to know about candidates running in CD1
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District: CD 1.
Geography: Arizona’s northeastern district includes 11 of the state’s 15 counties. It runs from the Utah border down to the outskirts of Tucson, pulling in Flagstaff and parts of Pinal County.
Incumbent: Rep. Tom O’Halleran, Democrat.
Tenure began: 2017.
History: This competitive district has had four different people represent it in the past decade.