I think you are overlooking the blatantly obvious point.
Logically, there is no possible way for you to be a sitting US Senator in one state and have your “official” residence in another.
And to try that indicates what kind of crook you are. In Kennedy’s case, it also makes him a hypocrite of the 1st order. He is one of the biggest proponents of higher taxes and more government.
And the Kennedys are exemplars of moral probity. Except to anyone with higher morals than the most immoral Mexican drug lord.