Gabriel Guerra-Mondragon, a former Ambassador to Chile, and a "Hillraiser" who's brought in about $500,000 for the Clinton campaign is defecting to the Obama campaign. It seems "he was uneasy with the tone of the Clinton campaign and was beginning to worry about what this would mean for the general election."

This is a reminder, I think, of the fact that Clinton has actually been incredibly effective at convincing the vast majority of her key supporters not to embrace this logic even though essentially all outside observers agree that at this point her campaign does more to help John McCain than to improve her own chances of winning the nomination. Of course, a handful of defections could easily snowball given time, were a handful to emerge.