One of the things that both Dem campaigns are always nervous about is defectors. In particular, Clinton is more vulnerable to this problem since she's the candidate that is trailing. Well, NBC News has learned that a major fundraiser for Hillary Clinton, former Amb. to Chile Gabriel Guerra-Mondragon is leaving the campaign to join up Barack Obama's campaign. Officially dubbed a "Hillraiser," Guerra-Mondragon raised nearly $500,000 for Clinton's campaign, according to some estimates. He has been informing people inside Clintonworld this week in what's been described as some tough conversations. A formal announcement of a role for Guerra-Mondragon on Obama's...