So, if Harris and Kelly were to be on the Democratic ticket and win, Gov. Katie Hobbs (D-AZ) would need to appoint someone to take Kelly’s seat. Like what happened in 2020, that scenario would trigger a special for the next cycle — 2026. Then, in 2028, the seat Kelly won in 2022 will be up for a full, six-year term.
https://www.coloradopolitics.com/how-a-mark-kelly-vp-pick-could-give-arizonans-a-senate-election-every-even-year/article_c3cac836-71e1-5436-89e2-a46c7a70beeb.html#google_vignette