Mike Castle trailing Christine O’Donnell in poll: What’s going on?

Christian Science Monitor: “Mike Castle might lose the Delaware Republican Senate primary Tuesday night. That’s what a new poll suggests, anyway. The Public Policy Polling (PPP) survey shows ‘tea party’ choice Christine O’Donnell holding a three-point lead over Castle, 47 to 44 percent . . . One possibility is that Castle’s possible fall, and Ms. O’Donnell’s possible rise, reflects the depth of voter anger against incumbents and the power of the tea party brand.”