From '00-08, Bush rose government spending to 3.2 trillion a year. From '08-'11, the spending increased to 3.8 trillion a year. However, 3.2 trillion of that was still a result of Bush's policies. Which means Obama's contribution was only 800 billion extra per year. Not only that, but under Obama, spending began to decrease in 2011. However, government spending is not the only thing that exploded the deficit. It was also a lack of government revenue which decreased significantly under Obama. That, I think, can be blamed on both Obama and Republicans. Obama for extending the Bush tax cuts, and Republicans for refusing to raise taxes.