An investigation by the Yavapai County Attorney has found there is enough evidence to show Arizona Attorney General Tom Horne violated campaign finance laws during his 2010 run for office. County Attorney Sheila Polk ordered Horne to return nearly $400,000 to donors and amend his campaign finance reports or she would also seek stiff civil penalties. Thursday's announcement marks the second time a prosecutor alleged Horne violated campaign laws. Polk found reasonable cause to believe Horne and aide Kathleen Winn worked together to raise about $500,000 through an outside group she chaired. Horne and Winn have denied the allegations.