A special election was held due to the death of Republican senator and presidential candidate John McCain.

Outgoing U.S. Representative Martha McSally was appointed to fill the seat following Kyl's resignation.

Republican Bob Burns was term-limited and therefore ineligible to run for re-election to a third term in office.

Consequently, poll results in the table immediately below are displayed as the accumulation of a candidate's first, second and third preferences, and therefore total 300%, instead of 100%.

[13] Proposition 207, the Smart and Safe Arizona Act, is to legalize and tax cannabis for adult use.