Assembly seat at stake under 'top-two' rulesToday could be the day California's new "top-two" primary system really gets its first test.Voters in the 4th Assembly District – covering Alpine County and parts of Placer, El Dorado and Sacramento counties – head to the polls in a special election to replace Republican Ted Gaines, who advanced to the Senate in January. Eight candidates, seven of them Republican, are on the ballot. The district is heavily Republican. Under the new rules, the top two finishers – regardless of party affiliation – will advance to a runoff unless one candidate wins a majority...