Even so, she ran a television ad that accused her rival of ducking a debate in the state and added that she had the only health-care plan that would cover all Americans and the only economic plan to stop home foreclosures. "Maybe he'd prefer to give speeches than have to answer questions" the commercial said.

Obama countered with an ad of his own, saying his health-care plan would cover more people.

Unlike the Democratic race, McCain was assured of the Republican nomination and concentrated on turning his primary campaign into a general election candidacy.

In one sign of progress in unifying the party, he split the conservative vote with Huckabee in Wisconsin.

Huckabee parried occasional suggestions — none of them by McCain — that he quit the race. In a move that was unorthodox if not unprecedented for a presidential contender, he left the country in recent days to make a paid speech in the Grand Cayman Islands.

McCain picked up endorsements in the days before the primary from former President George H.W. Bush and former Massachusetts Gov. Mitt Romney, a campaign dropout who urged his 280 delegates to swing behind the party's nominee-to-be.

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Contributing: Stephen Ohlemacher