Andy Biggs holds a commanding lead in the Arizona Republican primary for governor as traders price in his strong alignment with the party's conservative base and President Trump's endorsement. Karrin Taylor Robson's February withdrawal consolidated support behind Biggs, who has posted decisive polling advantages over David Schweikert in surveys conducted since the field narrowed. The July 21 primary leaves room for Schweikert to mobilize undecided voters through targeted outreach on fiscal issues, though current data shows limited movement. Late developments such as shifts in party endorsements or campaign spending patterns could still narrow the gap before ballots are cast.