From TMZ:

TMZ just spoke with Robert Novak, and one thing is clear: National Public Radio can be hazardous to pedestrians, especially the one he mowed down in D.C. this morning.

Novak tells us he was listening to "Morning Edition" on NPR in his Corvette when suddenly, "Some guy came up and hit my car with his fist. I figured I had done something that had created road rage, but I didn't know what it was. Then a bicyclist blocked the road in front of me. I asked what the problem was. He said, 'You can't just hit people and run away!'"