When Arnold Schwarzenegger overwhelming won the race for governor last year, he vowed to break the hold that special interests and fringe groups have in Sacramento. But Schwarzenegger found that promise hard to keep, in large part due to something he has no control over - the Legislature. The system under which California elects its legislators is engineered to elevate candidates who hold extremist views on the left and the right. Moderate, centrist candidates stand little chance because Democrats and Republicans conspired together to gerrymander legislative districts. The gerrymandering is so bad that one party or the other is virtually...