All that graph tells me is that Barack Obama has a responsibility to raise taxes and cut spending where it can be cut to end budget deficits and begin paying down the national debt.
Even if we're paying piddly amounts off, it's still better than constantly accruing more and more debt until the end of time, which it seems we are doing currently.
So it doesn't tell you anything about the relative successes or failures of the parties' approaches to economics in terms of true fiscal responsibility?
Now, granted, the sample size is small, but it at the very least puts the burden of proof on those who insist it is meaningless to explain why.
But yes, tax increases for the wealthy as well as ending the war in Iraq would go quite a long way towards budgetary responsibility, and hopefully these will both be accomplished within the next 4 years.