Today Senator Arlen Spector became the 13th U.S. senator to defect from his party since direct senatorial election began in 1913, also likely handing the Democrats a filibuster-proof majority. Though nothing may be done at this point to save the seat, we can ask how appropriate it is for an elected official to switch sides mid-term?  

Senator Spector’s argument for switching is that his political philosophy is now more aligned with that of the Democrats than it is Republican party philosophy. But what about the people who elected this Senator to his post as a Republican? Don’t those people have a fair expectation that he remain in that seat for the duration of his term? Ulimately, isn’t any elected official a public servant commissioned to represent his voter-base?  

If an official were faced with a decision between what is better for the country and what will appease his voters, I would argue that the official should choose what he considers right. However, as Sentor Spector claims he has always voted his conscious on each issue, I am not sure how changing parties could be justified along the lines of the country’s need. Even if changing parties (or any other major decision done for the good of the country but contrary to the voting-base’s expectations) were necessary, it would seem the official should at least disbuse his voting-base of their expectations with his thought process - which specific issues are troubling him and why this particular change is, or was, needed.   

So what do people think? Giving the Senator the benefit of the doubt that this change were something he felt needed to be done, should this be permitted? If so, what should the proper etiquette  be considering the expectations of the party members and other voters who placed him there?   

More generally, if an official has a stance on an issue which is contrary to what he/she knows his voting-base would think appropriate, shoud he represent his voter-base as commissioned to do, or vote according to his own logic and conscience? Perhaps each is appropriate at different times, and if so, how would he know which action were appropriate in the dilemma at hand?    

As a side note, it is interesting that almost half of those who have chosen to defect from their party have done so in the last 15 years…    

“In war each side may find a traitor on the other side very useful. But though they use him and pay him, they regard him as human vermin. So you cannot say that what we call decent behaviour in others is simply the behaviour that happens to be useful to us.”
-C.S. Lewis, Mere Christianity