If the media would do its job and not demonize one candidate while canonizing the other,(Saint Obama and Hillary the Witch) there would not be as much of a need for the candidate being smeared to point out that the other guy is not so pure, which then leads him to hit back - and the fight is on.
As for triangulating, the better question is why so many Democrats disparage Bill Clinton for triangulating, yet praise Obama for the very same thing, when it is called "bipartisanship"? How silly can you get?