why?
For one reason, he started out spending a lot of money that we don't have giving subsidies to people who wanted to buy more fuel-efficient brand new cars, for example. I'm sure that the manufacturers of Japanese automobiles were very grateful for these subsidies.
For another reason, he said that he wouldn't sign into law any health care reform legislation that didn't include a public option, then he signed it anyway without a public option, giving health insurance companies a huge bonus by requiring everyone in America to purchase private health insurance or face a penalty. One might think, "But at least the health insurance companies will have to begin covering children with pre-existing conditions." However, there's no teeth to that law without a public option, so they just stopped writing child-only health insurance policies in several states when the requirement began.