Gingrich is getting pounded on Iowa TV by both a pro-Mitt Romney super PAC and Ron Paul’s campaign and is doing little to fight back against ads which take direct aim at him. Less than three weeks before the caucuses, the former speaker is airing a single commercial with little money behind it.

And while Gingrich’s top rivals here flood the airwaves, three of his lesser challengers — all vying for the same swath of undecided conservative votes — began barnstorming the state in an intensive retail push before the January 3rd vote.

Gingrich’s response suggests a lack of urgency: on Wednesday he held a wonky seminar on brain science in this liberal college town. He had plans to return to Washington for a book-signing after Thursday’s debate in Sioux City, without scheduling any public events in the conservative-heavy northwest corner of the state.