Your average Democrat

Nice role model there Michaeld. Chubby probably lives out on there by himself because he's an anti-social paranoid who's incapable of getting along with others not like himself. No wonder he's a Republican.

First, the bottom-line number on the debt: Yes, it has grown by $5 trillion during Obama’s tenure. Total debt has increased by $5.5 trillion since January 20, 2009, while the share of that debt held by the public has increased by $5 trillion.

But it’s not entirely correct to hang that increase on "Obama’s spending" alone.

In our previous item, we looked at calculations by the Treasury Department based on data from the Congressional Budget Office, the independent number-crunching arm of Congress.

To figure out what caused the accumulation of deficits over the past decade, CBO tracked the surplus it had projected back in 2001 and compared it with the actual cumulative deficits that resulted instead. CBO specifically broke out how much several laws contributed to the deficit, some of which started under Bush and some under Obama.

Because American Crossroads was only referring to the debt added during Obama’s tenure, we only looked at fiscal years 2009, 2010 and 2011. And because the American Crossroads ad does not reference how much the deficits fell below the surpluses that had been forecast by CBO, we’re going to exclude from our calculations a category CBO called its own "failures to predict economic conditions accurately."

We added up the lost revenue and additional spending each year and then calculated their percentage of the deficits over those three years.

Spending

Spending initiated by Bush policies: 4 percent of total deficits in 2009, 2010 and 2011
Spending initiated by Obama policies: 11 percent
Other increases in discretionary spending: 32 percent
Other increases in mandatory spending: 6 percent

Revenue reductions

Revenue reductions initiated by Bush policies: 11 percent
Revenue reductions initiated by Obama policies: 13 percent
Other unclassified revenue reductions: 5 percent

Interest

Net interest: 19 percent

The spending increases traceable to programs clearly attributable to Obama, combined with the increase in discretionary spending on his watch, account for about 43 percent of the three years worth of deficits.

So if you’re talking about what "drove us $5 trillion deeper in debt," then a clear majority stemmed from sources other than "Obama’s spending."

If you expand the definition from "Obama’s spending" to "Obama’s spending and tax cuts," you get to a total of 56 percent. Throw in 13 percentage points for the added interest costs of Obama’s policies and you’re at 69 percent.

Our ruling

The American Crossroads ad claims that "Obama’s spending drove us $5 trillion deeper in debt."

But not all of the $5 trillion can be attributed to Obama's spending. Much of it can be attributed to his tax cuts and the policies of President Bush. On balance, we rate the claim Half True.