The Concord Monitor's anti-endorsement of Mitt Romney makes for some pretty good reading:
Add it all up and you get Mitt Romney, a disquieting figure who sure looks like the next president and most surely must be stopped . . . When New Hampshire partisans are asked to defend the state's first-in-the-nation primary, we talk about our ability to see the candidates up close, ask tough questions and see through the baloney. If a candidate is a phony, we assure ourselves and the rest of the world, we'll know it. Mitt Romney is such a candidate. New Hampshire Republicans and independents must vote no.
This makes me wonder why you don't see "undorsements" like this more often. In a multi-candidate field, this sort of thing -- who shouldn't win -- is often a more salient question than is the who should win issue.