A Maricopa County Superior Court judge has blocked a campaign finance violation case against Arizona's attorney general and an aide because it was improperly brought by the Maricopa County Attorney's Office.

Judge John Rea's Thursday ruling leaves an uncertain road ahead for the case against Tom Horne and aide Kathleen Winn. They were accused of illegally coordinating outside campaign spending for Horne during his 2010 campaign.

Lawyers for Horne and Winn argued that Secretary of State Ken Bennett was required to send the case to Horne's office, not Maricopa County Attorney Bill Montgomery.

Montgomery argued that Horne's conflict of interest made it logical for Bennett to send him the case.

But Rea ruled that while the conflict is clear the law required the referral to Horne first.

Montgomery says he won't appeal.