http://en.wikipedia.org/wiki/ Red_Diapers :_Growing_Up_in_the_ Communist _Left California's 51st congressional district  is a  congressional district  in the  U.S. state  of  California .  The district includes all of  Imperial County  and the extreme southern portions of  San Diego County  that run across the U.S.-Mexico border.  Cities in the district include  National City ,  Chula Vista