David Weigel
moots that Newt Gingrich isn't really affecting the race, he's just amusing to cover:
There are heated policy debates happening between the top tier candidates, egged on by the second (Paul, Bachmann, Huntsman) and third (Santorum) tiers. Gingrich isn't engaging in the debates. He derides moderators whenever they try to get him to criticize fellow Republicans, as if presidential primaries were not chances for the parties to define what they'll run on, what they stand for. Gingrich is campaigning independently of the field. You can see the finish line in his eyes: Enhanced stature, new requests for TV and speaking jobs, new books.