Some bitter ads are running on Valley television now that attack Reps. Jim Costa, D-Fresno, and George Radanovich, R-Mariposa, for their support of a San Joaquin River restoration bill. The ads depict the flushing away of water, and suggest the two congressmen are complicit in a deal that will hurt the Valley's water supplies.

Might this be the foreshadowing of a challenge to Radanovich from the right? More than Costa, he's probably the one whose political base is more likely to be undermined by an ad campaign like this. Some Madera County farmers like Dennis Prosperi have already publicly called on Radanovich to resign. This will bear further watching.