McCain can't remember how many homes he owns.
He scrambled to undo his response to Rick Warren that "rich" means an income of $5 million a year, but his answer to the Politico was a non sequitur. “I define rich in other ways besides income,” he said. "Some people are wealthy and rich in their lives and their children and their ability to educate them. Others are poor if they’re billionaires."
That's great if you're discussing philosophy. In terms of tax policy, it's not relevant.
UPDATE: A quick response from the Obama campaign: