OK, let's put it in context. Like most of us, I imagine, I listened to the pre-Superbowl O'Reilly/Obama interview. I knew in what context the President said it but I had to look up the transcript for it.

President Obama was referring to the fond belief the Republicans hold close that the President is "the most liberal US president ever", even though the facts don't even come close to supporting that view.

President Nixon is believed by the Republicans to have been an acceptably conservative president- I have heard it said that no other president in modern times could have gone to China as he did to proffer an olive branch. It was a very LIBERAL act.

As President Obama said in the interview, President Nixon proposed and passed a number of issues and laws, like the EPA (which the Republicans currently loathe) and set in motion a lot of regulations that affect our air and water even today. To the good. Those were LIBERAL acts.

President Obama, on the other hand, has not been able to pass many or even most of his liberal desires, due to the very same people who allowed President Nixon to get away with it.