As in, how far will he go in his over-the-top rhetoric, and how far will it take him politically? In this climate, it's hard to top Beck and Palin et al, and at some point one ceases to look "presidential," as Gingrich would like.On the other hand, this stuff likely plays well with the base:

Newt Gingrich has unleashed some of his most explosive language yet against Barack Obama, telling National Review Online that a "Kenyan, anti-colonial" mindset governs the president's actions, which he blasted as "authentically dishonest" and "factually insane."Gingrich's comments on the website of the conservative periodical were inspired, he said by a sharp-edged analysis of Obama by the conservative pundit, Dinesh D'Souza, in the latest edition of Forbes. In that article, D'Souza says that in his policies Obama is essentially channeling the soul of his late Kenyan-born father, an African "tribesman of the 1950s.""This philandering, inebriated African socialist, who raged against the world for denying him the realization of his anti-colonial ambitions, is now setting the nation's agenda through the reincarnation of his dreams in his son," D'Souza writes of Obama's father, Barack Obama Sr., who the younger Obama barely knew.Gingrich tells NRO that D'Souza's article is the "most profound insight I have read in the last six years about Barack Obama."

My piece is at PoliticsDaily.com.