Mitt Romney, running on a pledge to repeal President Barack Obama's health care overhaul as a costly federal power grab, has focused more than usual on the Supreme Court ruling this week.

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In campaign appearances in Virginia, New Jersey and New York, he offered supporters and donors a preview of his likely response to the decision.

"My guess is they're not sleeping real well at the White House tonight," a confident Romney told cheering supporters gathered Wednesday evening at a Sterling, Va., electronics manufacturer.

The night before, he told donors in New Jersey that if the Supreme Court lets the law stand, "it will make it very clear to the American people that they must elect someone who will stop it."

If the high court overturns the law, "then the first three and a half years of the Obama administration will have been entirely wasted, because that's where he devoted his energy and passion," the Republican said.

The stop in Sterling comes a day after he won the Utah primary.