Newt needs to go back to Negative Campaigning school

As effective as the pro-Romney Super PAC's ads were against Gingrich in Iowa, Gingrich's broadsides against Romney have mostly fallen flat.

First, there is the loss of credibility in pledging not to go negative, then doing so with gusto when feeling desperate.

But one of the first rules of negative campaigning is to use ammunition that is believable, credible, documented, and relevant. And oh yes, avoid name calling.

In the last 10 days, Gingrich has called Romney a "Liar" and "unAmerican," a...