Sarah Palin just offered a surprise endorsement of insurgent Delaware Senate candidate Christine O'Donnell, calling in to Sean Hannity's radio show to offer her support. The news broke mainly on Twitter, after O'Donnell and Hannity tweeted it. Dave Weigel points out some back-story here: O'Donnell's campaign manager, Matt Moran, comes from the campaign of Dave Hoffman, the Conservative Party candidate in upstate New York who briefly captivated people who follow special House elections when he ran a campaign, fueled party by Palin's endorsement, that eventually forced the Republican candidate out of the race and handed the seat to Democrats. It...