Obama is not responsible for the current situation. The last budget signed into law before Obama became President resulted in a $1.9T deficit. Obama's programs may have added a little to this number, but the budget had already been signed into law.
The real problem is that the U.S. is "growing" the economy using the federal budget deficit. Since Oct 1 2001, the economy has grown by about $500B per year, while the deficit has grown by about $167B per year. So, 1/3 of all economic growth during that period is directly related to the budget deficit.
As it now stands, the budget deficit is about 11% of the economy. If the budget is balanced overnight, the economy loses 11% overnight. I think this would cause quite a few issues. My guess is the government will continue trying to grow the economy by growing the deficit until no one, including the Fed, will buy the debt. Then, we will have a shock where the budget is forced to be balanced overnight. It would probably be better to have that shock now instead of waiting until the deficit is 15% or more of the economy.
And, the attention given to the $100B spending cut is almost laughable. Assuming a 5% long term interest rate, a $1.5T deficit adds another $75B per year to the deficit in terms of increasing the interest that must be paid. This nearly swamps out the $100B spending cut. So, you need a spending cut of $175B plus an additional cut of $75B each subsequent year to have an effective spending cut of $100B per year.