John McCain and Barack Obama traded increasingly barbed insults along with prescriptions for the ailing economy Tuesday as financial fears shoved aside lipstick on pigs and every other political issue in a blink with just weeks left in the long presidential campaign.

An ad by Democrat Obama sneered: "How can John McCain fix our economy if he doesn't understand it's broken?"

Getting even more personal, Republican McCain retorted: "Sen. Obama saw an economic crisis, and he's found a political opportunity. My friends, this is not a time for political opportunism; this is a time for leadership."

McCain commented as he and running mate Sarah Palin addressed a rally late Tuesday in Vienna, Ohio.

The verbal dueling showed the importance both candidates put on the issue of the economy as the continuing financial meltdown on Wall Street has driven all other issues out of the news. Both campaigns now believe the candidate who manages to wrest control of the issue and gain voters' confidence could well be the next president.

Earlier in the day, McCain called for a crisis commission, while Obama laughed that off as "the oldest Washington stunt in the book."

"This isn't 9/11," Obama told a noisy crowd of more than 2,000 at the Colorado School of Mines, dismissing the idea of a need for study. "We know how we got into this mess. What we need now is leadership that gets us out. I'll provide it. John McCain won't."

McCain, campaigning in Florida, promised reforms, too, to expose and end the "reckless conduct, corruption and unbridled greed" that he said had caused the financial crisis on Wall Street."

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