The Democrat primary was won by Delina DiSanto with 74% of the vote.<ref name="2020 Arizona primary results"/>
The Democrat primary was won by Delina DiSanto with 74% of the vote.<ref name="2020 Arizona primary results"/>
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====AZ-4 General election====
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Gosar handily won re-election to another House term.<ref name="Rep. Tom O'Halleran wins a third term; all of Arizona's US House incumbents reelected"/><ref>[https://kyma.com/news/2020/11/05/rep-paul-gosar-wins-re-election-fighting-for-trump-win-in-az/ Rep. Paul Gosar wins re-election, fighting for Trump win in AZ]</ref>
[[File:Repschweikert.jpg|thumb|left|185px|Rep. Schweikert is facing a tough re-election fight.]]
[[File:Repschweikert.jpg|thumb|left|185px|Rep. Schweikert is facing a tough re-election fight.]]