On Saturday night, Newt Gingrich and Herman Cain met in Texas for a special, one-on-one “debate.” But anyone who tuned in hoping for fireworks would have been disappointed. It might have been more accurate to call it a joint campaign appearance.

The debate seemed like an extremely promising idea when it was announced a few weeks ago. Gingrich and Cain are probably the two most entertaining candidates in the current Republican field — the former speaker with his acerbic wit, the businessman with his thunderous exhortations. Both are running “non-traditional campaigns,” which is a euphemism for not running much of a campaign at all. For both men, their blundering into the top ranks of recent polls seems to have spoiled an otherwise pleasant book tour.