"But the biggest problem is that this is just dumb math. What really counts is not the raw debt numbers, but the size of the debt as a percentage of the gross domestic product."
Really? Dumb math? Maybe you could argue that's a methodological error. But the bad math accusation doesn't really hold water here. (There apparently had been a math error but Nancy Pelosi's office corrected it and that's reflected in the chart above.) The math is perfectly fine.
What they would like to see is a chart which shows debt as a percentage of GDP. Which, by wacky coincidence, makes Obama look bad (although it arguably makes Republicans look worse).
But the claims that Pelosi is somehow "cherry - picking" her data by insisting the data be cherry-picked even more is absurd. Yeah, if we put enough disclaimers on our charts (that it's "public" debt vs. gross debt) or add enough figures (debt as a portion of blonde-haired-children GDP) then I'm sure we can find numbers that will please the Tea Party.
But the fact is that the chart isn't bogus.