David Broder's gushing encomium to Arnold Schwarzenegger's newfound moderations has already been rightly, resoundingly mocked throughout the blogosphere. Broder's belief that Schwarzenegger's election-year conversion to a liberal agenda "demonstrat[ed] in the most dramatic way possible the value of political independence" is so naive as to be hilarious, particularly coming from an ageless political observer like Broder. Schwarzenegger's actions demonstrate the value of being liberal in a liberal state. Had Arnold gone independent in the opposite direction, as he had in the preceding period, we'd all be buzzing with excitement over incoming governor Phil Angelides.
That said, there is an interesting dynamic that Broder fails to note. When the legislature is controlled by one party and the governor hails from the other, election year conversions on the part of the executive can actually be much more successful. Say you have Democrat Gray Davis and a Democratic Congress. Gray wants to herald the election by passing some major global-warming bills, a minimum wage increase, and various other do-gooder bills. Republicans want to deprive him of the accomplishments. And so they do: They filibuster, they block, they hold up in committee. They keep the legislation from happening, as it both offends their ideology and harms their political chances.
Now let's say you've a Republican governor with a Democratic legislature. He spends part of his first term trying to govern from the right, and is stymied at every turn. Come election year, polls show him behind, so he decides the minimum wage really isn't that bad after all, and while some warmth is nice, he doesn't really want the planet cooked. So he pivots and begins pushing a liberal agenda. The Republican Party in his state, completely yoked to his success, will not block the legislation. They need him to succeed, and win reelection. And the Democrats in the legislature want the bills. And the governor wants the accomplishment. It's a much smoother process that sets up incentives allowing divided governments to pass a whole lot more legislation than governments dominated by a single party.
That's what Arnold was able to do. His "independence," while completely opportunistic, actually allowed for much more liberal legislation than a Democratic governor could have passed. Had Bustamante been wielding the pen, Republican legislators would have blocked his agenda. As it is, Arnold decided to go liberal but, being a Republican, could do it without his party's outright opposition. Neat trick, and one that's had good results for California.