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WASHINGTON: In the end, it all came down to Chief Justice John Roberts, the sphinx in the centre chair, who in a stunning decision wove together competing rationales to uphold President Barack Obama's health-care plan.

Roberts' action instantly upended the conventional wisdom that he would vote with his four fellow conservative justices on the US Supreme Court and undercut the agenda of a Democratic president, who as a senator in 2005 had opposed Roberts' appointment to the bench.

But Thursday's extraordinary conclusion to the bitterly fought health-care battle was quite ordinary in some ways. Roberts hewed to a traditional Supreme Court principle that if the justices can find any constitutional grounds on which to uphold a law, they should do so. The 57-year-old chief justice also followed a stated principle of his own narrowly deciding cases and trying to preserve the integrity of the judiciary in polarized Washington.

While he has voted consistently with the conservative bloc on social issues, such as abortion rights and racial policies, Roberts in his public remarks has suggested that he seeks, as chief, to transcend an ideological label. He routinely refers to the court's place in history and has bristled at polls and public commentary that suggest the high court acts in the same political realm as the two elected branches of government.

Indeed, in his comments during oral arguments in the health-care case, Roberts hinted that he could be open to siding with the government. He expressed concern that the court over which he presides might be seen as ignoring more than 75 years of precedent and rolling back US law to the New Deal era. The last time the Supreme Court struck down a major act of Congress was in 1936, when the court invalidated a federal law that limited work hours and prescribed minimum wages for coal workers.

"He is positioning the court as the one, competent, principled institution in Washington," said Pamela Karlan, a Stanford University law professor. "The chief justice's opinion is designed to appear thoughtful, measured. He is in this for the long haul."

Defying History

As the lone conservative standing with four liberals, Roberts defied recent history, most people's expectations, and the deepest held hopes of the right-wing and Tea Party opponents of the law. He also rejected the prevailing view of Republican politicians, who had been his strongest backers when President George W. Bush nominated him five years ago.

"The court avoided, despite an enormous amount of pressure to invalidate this law, staining itself as excessively partisan," said Bradley Joondeph, a law professor at Santa Clara University. "Think of the people who supported Chief Justice Roberts, who put him on the court, who were rooting for him."

On the Roberts court, the swing-vote role has often been played by Justice Anthony Kennedy, not the chief himself. For example, Kennedy, a conservative appointed to the court by President Ronald Reagan in 1988, was crucial to its 1992 decision to uphold the right to abortion. Thursday's case marked the first time that Roberts joined the liberal bloc as the deciding fifth vote in a major case.

On Thursday, Kennedy fell in with the conservatives and read their joint dissent. In it, he took a swipe at Roberts' claim that the court was acting cautiously. "The court regards its strained statutory interpretation as judicial modesty," Kennedy wrote. "It is not. It amounts instead to a vast judicial overreaching."

A Pyrrhic Victory

Roberts did hand the conservatives a pyrrhic victory. He rejected the Obama administration's main argument that the core of the law, a mandate that requires most Americans to buy health insurance by 2014 or face a penalty, was covered by Congress's power to regulate interstate commerce. Roberts said that power, while broad, does not extend to "inactivity," such as the choice not to buy insurance.

Whether this apparent limiting of the Commerce Clause will hinder Congressional power in the future remains to be seen. In their briefs and arguments, both sides characterized the health insurance mandate as distinctive, and it is unclear whether another Congressional regulation could be struck down under the Roberts "inactivity" rationale. Roberts' judgment on the Commerce Clause issue was endorsed by fellow conservatives Kennedy, Antonin Scalia, Samuel Alito and Clarence Thomas.