Furthermore - doesn't blatant hypocrisy bug you? Regardless of who is doing it? Shouldn't the exposure of hypocrisy be a good thing for a healthy campaign and an honest political discourse?
It has been noted that excessively partisan individuals--regardless of ideology--are pretty much incapable of critical thinking when it comes to their own party (which is always deemed "good") and the party it opposes (which is always deemed "bad") to the point of irrationality.
I'm not here to accuse any one individual or candidate's supporters here of this, as I think that numerous people here have been guilty of it. This is why the learned skill of critical thinking is all the more important. I know I've been guilty of it in the past, and I'm actually quite thankful that John Kerry turned out to be a steaming pile of shit for a candidate, because now I don't feel loyal to any party or candidate or believe that any party or candidate actually cares about my interests. Nonetheless, you can still support a candidate without having blind faith in them, as I have come to the decision that Obama, in spite of being imperfect, is preferable to McCain, who I believe is much worse.
To answer your question, to an excessively partisan individual, exposing hypocrisy is only important, as long as the party they hate is the one being exposed. If hypocrisy is being exposed to the party that they "believe" in, well, then we must rip apart the source that's exposing the hypocrisy and deem it non-credible or biased, regardless of the facts. Cognitive dissonance dilemmas solved.