In 1858, Abraham Lincoln was known as a successful Illinois lawyer who had achieved some prominence in state politics as a leader in the new Republican Party. Two years later, he was elected president and was on his way to becoming the greatest chief executive in American history. What carried this one-term congressman from obscurity to fame was the campaign he mounted for the United States Senate against the country"s most formidable politician, Stephen A. Douglas, in the summer and fall of 1858. Lincoln challenged Douglas directly in one of his greatest speeches -- "A house divided against itself cannot stand" -- and confronted Douglas on the questions of slavery and the inviolability of the Union in seven fierce debates. As this brilliant narrative by the prize-winning Lincoln scholar Allen Guelzo dramatizes, Lincoln would emerge a predominant national figure, the leader of his party, the man who would bear the burden of the national confrontation. Of course, the great issue...