I only saw the Kerry side of things and must say that Daily Kos and Jakob Nielsen's respective analysis are right on. I got so bored with having big-shot democrats beg for money is so many so boring emails, that I just deleted them like other spam.
Similarly, in the snail-mail box for that matter. I gave pretty generously to the Kerry campaign - the first time I have ever donated to a political campaign. While it is impossible to measure it,I am pretty sure that the democrats sent me snail mail of equal cost to the money I had donated. Thus, rather than providing funding for advertising or get-out-the-vote drives in Ohio and Florida, it felt like the money primarily was used to try to squeeze even more bux out of me. For me it was annoying and disappointing, for others, perhaps a true turn-off.