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CHICAGO — Barack Obama has found something that eluded him during the primary season — contrast.

And the presumptive Democratic presidential nominee is basking in it.

"He will not bring change," Obama always asserts, rightly or wrongly, of presumptive GOP nominee John McCain. "I will."

In McCain, Obama faces an opponent who is the opposite of him in every way — an Iraq war backer who supports free-market economics, opposes abortion rights and is a Republican. Obama delights in pointing out the differences, and does so often.

To be sure, McCain returns the favor at his campaign events.

But vast disagreements with McCain — on everything from economic philosophies to security proposals — seem to have given Obama license to more aggressively and enthusiastically go after his foe. It's a turnabout from his more cautious approach in the Democratic primaries when he faced Hillary Rodham Clinton, a fellow Democrat with whom he differed little.

These days, Obama assails McCain's position on the issues every chance he gets. He levels his charges with a commonsense tone and lighthearted touch that couch the criticism while making his core argument: McCain and President Bush are the same.

"If you are satisfied with the way things are going now, then you should vote for John McCain," Obama says before rattling off a list of current concerns, including rising gas prices, home foreclosures and job losses as the country fights two wars. Then, Obama promises "fundamental change."

He sought to stay on point with that pitch last week despite hitting a couple of bumps.

A precautionary detour to Missouri because of a malfunctioning plane meant scuttling a North Carolina event. Obama briefly forgot to ask his donors to help retire Clinton's debt at a fundraiser intended, in part, to do just that. And, two allies caused a stir; the Rev. Jesse Jackson criticized Obama, while comedian Bernie Mac made eyebrow-raising jokes during an introduction.

Even so, a seemingly unfazed Obama tore through the week with McCain in his sights, giving the impression that he's becoming at ease with his newfound role, and, perhaps, running for president on the whole. At times, he came across witty, relaxed and confident, and much more comfortable than he was during the heat of the primaries.

Perhaps it's because there's now a measure of clarity in the race, with an opponent from the other camp with a completely different take on the issues. Perhaps it's because polls show Obama slightly ahead, while McCain has seemed unable to lay a glove on him. Perhaps it's because the campaign days are lighter — at least for now.

Regardless, Obama probably would be wise to guard against becoming too comfortable.

If the primary race taught him anything, it's not to take anything for granted or coast through the next few months. That may be one reason why the Democrat seemingly has been relentless in contrasting himself with McCain.

At a Georgia appearance, Obama noted McCain's long support for the Iraq war and objections to a troop withdrawal timetable. Conversely, Obama said: "I opposed this war from the start," and "I will bring this war to an end."