Can you guess who was so careless?

Names deliberately excised.
“I would suggest moving back,” he said as he climbed into the cab of a massive D-10 tractor. “I’m about to crank this sucker up.” As the engine roared to life, staffers tried to steer the press corps to safety, but when the tractor lurched forward, they too were forced to scramble for safety.”Get out of the way!” a news photographer yelled. “I think he might run us over!” said another. Aides tried to herd the reporters the right way without getting run over themselves. Even security got involved, as one agent began yelling at reporters to get clear of the tractor. Watching the chaos below, he looked out the tractor’s window and laughed, steering the massive machine into the spot where most of the press corps had been positioned.
Can you guess who was so callously careless with heavy machinery?
http://www.talk.newsweek.com/default.asp?item=464251