<p>When California voters head to the polls on Tuesday, Democrats will select a challenger to President George W. Bush and Republicans will pick their contender against U.S. Sen. Barbara Boxer. Equally important, in a state where party control of legislative seats is all but assured by redistricting, it is these same Democratic and Republican voters who will determine which of the current primary candidates will go on to reap lopsided state Senate and Assembly victories in the general election this fall.</p>