LOS ANGELES -- A special congressional election Tuesday in California has given Republicans a surprising opening to seize a House seat in a Democratic stronghold and send a powerful message nationally going into 2012.Democrats hold a commanding 18-point registration edge in the district where Barack Obama notched a 31-point win in 2008, but the likelihood of a meager turnout, combined with widespread voter anxiety over the economy, could make for a tight finish.Read More... More on Barack Obama