The current Republican exchanges? Besides those, the Lincoln-Douglas debates, according to the popularizing Lincoln scholar Harold Holzer. He responded to Newt Gingrich's call for Lincoln-Douglas debates against Obama. Holzer, however, reassures us that "Rather than inspiring memorable words, they proved for the most part an embarrassment." In fact, in his view, they show Lincoln's racial bigotry:
"I am not, nor ever have been, in favor of bringing about in any way the social and political equality of the white and black races," he declared in Charleston, Ill., to robust cheers, "nor ever have been in favor of making voters of the negroes, or jurors, or qualifying them to hold office, or having them to marry with white people." It was not the future emancipator's finest hour.
This is mediocre historian shallowness, which ignores what Lincoln might do in the future--shown clearly by the Emancipation Proclamation, his allowing blacks to fight in the Union army, and his early policies for reintegrating the South. Lincoln had no reason to speak of such civil and political equality, when most blacks were slaves. This superficiality breeds ignorant Lincoln haters and other cyncial leftists who despise their country. Though Holzer describes well the excitement of the debates, he, like most historians, simply doesn't see the principles involved. Ultimately, he does not understand the subjects as they understood themselves.
Read Harry Jaffa, author of the best book on political science since The Federalist. Crisis of the House Divided is also available via google books. Ashbrook has a pdf as well, but I can't find it. In the meantime here are some short essays by real Lincoln scholars.
Our friend Jack Pitney is skeptical of Newt's debating skills.