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Listen to this 'Talk of the Nation' topic

Karl Rove surprised a lot of people on Monday morning with the announcement that he'll leave the White House at the end of the month. It leaves the president without his main political architect as he heads into the final months of his term. The impact of that is still up for debate. But, even many of Rove's critics have to admit that he has an impressive track record. They say he's earned the nickname "Evil Genius." Of course, he's not likely to just disappear. Since his announcement, Rove has taken shots at Democrats in congress, predicted Hillary Clinton would be the Democratic nominee for president, and promised that he'd stay involved in politics. Don't be surprised if a book or two is in the works. How important was Rove to President Bush? Can he really be replaced? And what will Rove do next? We'll talk about it with Wayne Slater and Ken Rudin. And get into the Iowa straw poll, the new ad from Hillary Clinton, and the rest of the week's political news. There's so much going on, we'll super-size the political junkie today (the segment, not the Ken).