It is correct that the Republicans are responsible for the bulk of the debt we are faced with. However, Obama is adding to it faster than any of his predecessors and that's an inconvenient truth the OP has ignored. Furthermore, just because earlier presidents spent irresponsibly doesn't make it ok for Obama to do it. He was supposed to be the president of "change" after all.
Actually, it's about 50/50 on 'responsibility'.
The problem these days is it's gotten to the point where it is unsustainable. Historically, it was stupid, but survivable. Now, it is not. For that, I blame Bush and Obama, Republicans and Democrats. Because that is rational.
Instead of whining about who's to blame, why won't you people* focus on fixing the problem before you destroy the country?
* You people - generally partisan ******* halfwits.