A collection of political news from across the state making headlines today: 

• Horne bid to block investigation is rejected tucson.com

• Flake: Unaccompanied minors complicating immigration reform tucson.com

• Ad Watch: McSally releases third ad, "Stand up" tucson.com

• Ad Watch: Barber releases second ad, "Flying" tucson.com

• GOP rivals use Obama as weapon in primary azcentral.com

• Yavapai County early ballots contain mistake in Spanish azcentral.com

• Huppenthal posts video after 'flip-flopping' accusations azcentral.com

• New IE running TV ads for Smith azcapitoltimes.com (subscription required)

• Firefighters union backs Smith, will focus on independents azcapitoltimes.com (subscription required)

• From the editor: McSally answered the question gvnews.com

• Democratic candidates rally in Amado gvnews.com

Contact reporter Joe Ferguson at jferguson@azstarnet.com or 573-4346. Follow him on Twitter @JoeFerguson