Of the $4.1 million spent to help four candidates vying for two open seats on the board that regulates Arizona's utilities - more than in any previous Corporation Commission race - the source of more than $3 million of that is shrouded in secrecy. The so-called "dark money" has gone entirely to help Republicans Tom Forese and Doug Little.

Two Republicans hoping to sit on the Arizona Corporation Commission lashed out June 25 at a decision by the state Department of Revenue to impose property taxes on leased solar panels.