Writer Garry Wills on Lincoln and the Gettysburg Address

Wills has analyzed the legendary speech in a new book called "Lincoln At Gettysburg: The Words That Remade America." He says that, speaking for only three minutes that day, Lincoln changed the history of American political thought.

Critic Maureen Corrigan compares the speeches of Abraham Lincoln and George Bush by way of two new books: "Lincoln at Gettysburg: The Words that Remade America," by Garry Wills, and "Bushisms: President G.H.W. Bush in his own Words," compiled by the editors of the "New Republic."

In a new book about the constitutional separation of church and state, Pulitzer Prize-winning historian Garry Wills insists that that separation was meant as "the great protector of religion, not its enemy." That, as Wills tells guest host Dave Davies, hasn't stopped fervent believers from challenging the concept.

Wills, a translator of St. Augustine and author of What Jesus Meant, is an emeritus professor of history at Northwestern University; the new book is titled Head and Heart: American Christianities.