I've been shuttling between Washington DC and Boston a lot this summer and have been joined on my travels twice by leading lights of the US Senate - Joe Lieberman and Ted Kennedy. The difference between the two? Lieberman flew first-class while Kennedy took an aisle seat in an exit row in coach (alright - so I'm not sure how comfortable I was entrusting my safety to him in case of an emergency.....). And within 30 minutes of landing at Reagan National Kennedy took the Senate floor to fight against William Pryor's judicial nomination; Lieberman, met by a state trooper on arrival at Logan Airport, was heading to a New Hampshire fundraiser.