The Great Recession is a factor
It should be pointed out that one of the reasons for a large part of the deficit since 2007 is the drop in income tax receipts due to the Great Recession.
Also I'd like to say that if you look at history the federal debt has generally risen more under Republican administrations than Democratic administrations. The D's may be "tax and spend" but the R's do "borrow and spend" and say to quote Dick Cheney "Deficits don't matter." (unless it's a Democratic administration).