President Obama has launched a website called "Reality Check" which is designed to debunk "rumors" about health care reform. This is quite similar to the "Fight The Smears" website the Obama campaign launched during the presidential election last year.
Politically, the Obama Administration defends itself in a way the Bush Administration never would. Too often the Bush Administration would ignore their critics and unfortunately by staying silent the critics defined much of his agenda. So in this way the Obama Administration is far more vigorous in defending their own agenda.
But, of course, the Obama Administration might have gone to the well once too often. President Obama has proven he can fool some of the people some of the time. It remains to be seen if he can fool all of the people all the time.