COLUMBUS, Ohio -- Barack Obama on Friday defended his character against mounting attacks from John McCain, daring his Republican opponent to run as negatively as he wants in the final weeks of the race while predicting that, in light of the financial crisis, ``it will not work.''

Both candidates responded to the stock market meltdown with new policy proposals.

McCain, in Wisconsin, suggested waiving a tax rule requiring that investors begin selling off their IRAs and 401(k)s when they turn age 70 ½.

Obama, in Ohio, pitched temporarily lifting lending fees and extending fixed-rate loans to small businesses through a Small Business Administration disaster relief fund.

But the dramatic personal nature of the campaign overshadowed those developments.

''We know what's coming. We know what they're going to do,'' Obama told supporters in Chillicothe and later in Columbus.

McCain's campaign announced a national TV ad that asserts Obama worked with a ''terrorist'' when it was politically convenient and then lied about their relationship.

The man, Bill Ayers, is a professor of education at the University of Illinois at Chicago who in 1995 hosted a candidate event for Obama and was involved with two mainstream charitable groups in which Obama also had been active. Chicago Mayor Richard Daley has praised Ayers as a leading citizen who helped shape the city's innovative schools' program.

In the late 1960s and early '70s, when Obama was a child, Ayers belonged to the radical anti-war group, the Weather Underground, which advocated violence and placed bombs at the Pentagon and the Capitol.

McCain's accusation is that Obama understated what he knew about Ayers' past or his beliefs when it suited him. There's no evidence that the two men are close or that Ayers has any connection to Obama's presidential campaign.

At a rally Thursday, McCain himself used the word ''terrorist'' to describe Ayers, and many McCain supporters were whipped into a lather as they voiced fear and indignation at Obama's ascent. Many participants chanted ''liar, liar'' when Obama's name was mentioned.

At a Friday morning rally in La Crosse, Wis., McCain seemed to dial back the tone. He didn't mention Ayers, and perhaps his most negative words were to paint Obama as ``a Chicago politician.''

Earlier in the week, McCain, in New Mexico, insinuated that Obama was hiding aspects of his past, asking, ``Who is the real Barack Obama?''

McCain did not reference race or religion, but the open-ended question may have stirred voters who believe that Obama, who's Christian, is Muslim because his Kenyan father's family was Muslim.

''Nothing's easier than riling up a crowd by stoking anger and division, but that's not what we need now in the United States,'' Obama said in Chillicothe and Columbus. ``The American people aren't looking for someone who can divide this country. They're looking for somebody who will lead this country. Now more than ever, it is time to put country ahead of politics.''

''They can try to turn the page on the economy. They can try to deny the record of the last eight years,'' Obama said. ``They can run misleading ads. They can pursue the politics of anything goes. It will not work. Not this time.''

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