However, your claim is he poorly represents his constituency who are pleased enough with him and continue to vote him into office.
While you say he is "out of touch with society", it is made clear by the reaction of his constituency that he is not "out of touch" with them. His responsibility is to represent them in Congress as a Congressman, as you have oft repeated. They have made it clear that they are happy with such representation. And running for President when he knows that the best he can do is get some of the debate over to issues he considers important, like the war, makes no "He has a responsibility toward...<insert your pet project here>."
He quite literally, at such a place and time has only a responsibility to get the message out that he literally ran to get out.
While, amazingly, he is going to win by the hugest landside in American history, it is not his "responsibility" to work and act as BAC would. Or to speak only on issues that BAC thinks he should.