In an interview on the radio this morning, Jim Hansen said that Chuck Oxley, the communications director for the Idaho Democratic Party, has "moved on." Hansen said something about new challenges, but didn't really praise Oxley, so I'm guessing it wasn't a happy event. I suppose Chuck just wants to spend more time with his family.
Update: I still have no idea what, if anything, caused Chuck to leave at such a crucial time. I just wanted to mention that on the one occasion I met Chuck he seemed friendly and gracious, and interested in (though not greatly informed about) the blogosphere. So, good luck to Chuck Oxley and best wishes in his next endeavor.
Later update: Boise Weekly has more here.