In late June, I was at a candidate forum in Sun City West, a sprawling retirement community northwest of Phoenix, when an Arizona Republican sitting next to me leaned over and offered a suggestion. “You need to do a story,” she said, “about the ads Masters is running against Hamadeh.” The primary, which ends on July 30, features both Blake Masters, the party’s 2022 nominee for US Senate, and Abe Hamadeh, the party’s 2022 nominee for attorney general.