Donna Gratehouse, who blogs at Democratic Diva and elsewhere on all things Arizona, sends us this.

With a recent poll showing Paul Penzone, Joe Arpaio’s challenger for Maricopa County Sheriff, trailing the longtime incumbent by only a few points, Penzone’s campaign got a shot in the arm yesterday when a coalition of Latino and progressive activists and the Adiós Arpaio campaign delivered more than 21,571 new voter registrations to the county. The effort was led by the Campaign For Arizona’s Future, and on Thursday, a crowd wearing “Adiós Arpaio” T-shirts announced the bonanza of newly registered voters at the Wells Fargo building in downtown Phoenix, where Sheriff Arpaio’s suite of offices is located.  

Demonstrators brought moving boxes with them in order to, as a young Dreamer student named Hector told me, “help [Arpaio’] pack his things in November.”

Penzone’s campaign has been hammering Arpaio over his department’s mishandling of hundreds of child abuse cases. Arpaio, who is said to have a $4 million war chest, is obviously worried. He is running ads touting Tent City, Arpaio’s infamous canvas jail in the desert, and his supposed efforts to enforce child support. Arpaio, who is 80 years old, is facing the toughest election of his 20-year career.