A state commission said Monday it will not ask a federal judge to clarify her ruling invalidating a key portion of Arizona's public campaign finance system — a setback for Republican Gov. Jan Brewer, who is being outspent by a wealthy opponent.

While much of the attention has been focused on the gubernatorial race since a federal court upheld matching funds, another candidate for a statewide race also is likely to benefit from the opinion — Sen. Barbara Leff of Paradise Valley.