As much as I would like to settle for your response, I just can't -- and neither should you.
Being a realist does not mean that we can pretend that politics exists as some independant force. The situation you describe is only as it is because we -- at least a great many of us -- want it that way. Were it otherwise, the approach you mention as being necessary to gete elected, would not work! We could reject those candidates who focus on the negative, especially the personal details of their opponents' lives.
And in terms of last night, the candidates actually coalesced in defense of Gingrich's outburst regarding the inappropriatness of John King's openining question. And in truth, was it REALLY the best opening if we REALLY do want more than a soap opera?