Who is responsible for the US debt?

In true economic revisionist style, it seems the nutbag right is trying to blame the US foreign debt on Obama.

I decided to do some research of my own and compiled this spreadsheet.

It's true that the debt has risen under Obama - but the bulk of it - by far, was generated under Bush. 

Seriously, how do these disingenuous right wing nutters sleep at night ? Considering what Obama inherited it's amazing that it's not higher now.

I guess those wars didn't come cheap.