Since 2005, Bill O'Reilly has waged jihad against Dr. George Tiller, dedicating 29 segments of his show to demonizing and dehumanizing Tiller, who he invariably called "Tiller the baby killer."
As you can see from these video clip samplings of O'Reilly's holy war, you don't have to actually pull the trigger to help sponsor terrorism:
Update, by Jed (9:34AM): Greg Sargent reports O'Reilly will address his role in the attack on George Tiller tonight. We'll be watching it so you don't have to. Tune into Keith Olbermann and Countdown instead.