Since Obama added more then 2.5 trillion in less then 2 years in office. how do you get that he adds about 1 trillion over 4 years?
If Obama kept spending like he did in the first year and a half he was in office. he would have easily added over 6.6 trillion to the national debt in the first term. and that would be easily 13 trillion in a 8 year period.
so if Obama would have been able to keep spending at the same rate he did in his first year and a half. he would have doubled the U.S. national debt in his 8 years.
So what the U.S. took 230 years to do. Obama would have done in 8.