FROM CNN's Jack Cafferty: The British Prime Minister broke protocol big time during his trip to the U.S. – he flew commercial. [cnn-photo-caption image=http://i2.cdn.turner.com/cnn/2010/images/07/21/art.british.air.jpg caption=""] As one British reporter put it, David Cameron was "slumming it in business class" on the flight from London to Washington. How refreshing. Cameron didn't take his own private jet, … Continue reading British prime minister flies commercial to U.S., lesson for our politicians?