Today's Supreme Court is often referred to as Anthony Kennedy's Court. Although Kennedy is the swing justice who usually casts the deciding vote in close cases, the landmark ruling this week in the healthcare cases clearly marks the maturation of the "Roberts Court."
Chief Justice John Roberts was the surprising swing vote in today's Obamacare decision. Although he agreed with the four conservative justices, including Kennedy, that the individual mandate was not a regulation of interstate commerce, he voted with the Court's moderates to hold that it was justified as a tax. Because people who don't obtain insurance pay a tax to the IRS, the mandate was within Congress's power to raise taxes for the general welfare. As a result, the Affordable Care Act was upheld.
With this deft ruling, Roberts avoided what was certain to be a cascade of criticism of the high court. No Supreme Court has struck down a president's signature piece of legislation in over 75 years. Had Obamacare been voided, it would have inevitably led to charges of aggressive judicial activism. Roberts peered over the abyss and decided he didn't want to go there.