On the one hand, certainly the presidential field shouldn't simply be used as a publicity platform. On the other, sometimes Gingrich has some solid ideas and points that can profitably be shared with the other candidates -- and no doubt his presence at the debates requires other contenders to "up their games" . . . all good.
Might one of the campaigns with a real shot at success be smart enough to bring Gingrich discreetly into their fold, with careful supervision (lest he tarnish the campaign with his all-too-frequent gaffes), so that the candidate might benefit from Gingrich's better ideas, while being able to edit out his unhelpful ones?