I am not busting on you, rather the opposite: I am hoping you can convince me.
Also, many wonder why our site would get this kind of stuff from the Kerry people. Also a fair point that we've been asked before. Without giving away too much there are several factors. One, could simply just be a friendly personal relationship between people.
Second, we are under no illusion about the motives of our sources. There is a lot of backbiting and one-ups-manship in campaigns and sometimes people like to trash a competitor inside their own campaign to gain proximity to decision-makers and campaign leaders. While these may not be the purest of motives, we just want to get the information out there.