Bush spent too much, driving up the deficit. Here’s the thing: Bush did a bad thing – but Obama took it and is running with it. He has made NO effort to reverse the spending – quite the opposite.
Here’s an article comparing the Bush Deficit vs Obama Deficit in Pictures that lays it out in detail.
Closing line from the article: “Overall, President Obama’s budget would add twice as much debt as President Bush over the same number of years.”