Ducey, Horne lead statewide candidates in spending 

Doug Ducey reported spending $581,000 on the Republican primary for state treasurer, more than any state-level candidate except for Buz Mills' defunct gubernatorial campaign.

Ducey, the former CEO of Cold Stone Creamery, spent $100,000 in the week before the Aug. 10 trigger report was submitted to the Arizona Secretary of State's Office. Partly due to the spate of television ads he's aired, Ducey has spent more than every state treasurer candidate from the past two election cycles combined in his four-way primary.