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Anyone who has watched the bitter competition between the Democrats and Republicans in Congress in recent years, or the fight to win the Republican nomination for President this year, might be wondering how to explain the current political party system in the United States. It looks like a period of deep ideological cleavages between the parties, and strict enforcement of some form of ideological correctness at least in one of them. Yet for decades or even centuries, scholars of politics have argued that ideological divisions were relatively weak in U.S. elections and legislative process. What is happening, and what has happened? Professor John Zaller of UCLA is one of the leading scholars of both political parties and public opinion in the country and here he explores these questions central to understanding the current state of American politics.

Paul Krugman, Nobel Prize–winning economist and New York Times columnist discusses his latest book, "End This Depression Now!" The Great Recession is more than four years old—and counting. Yet, as Paul Krugman points out, "Nations rich in resources, talent, and knowledge—all the ingredients for prosperity and a decent standard of living for all—remain in a state of intense pain." How bad have things gotten? How did the U.S. get stuck in what Krugman argues can only be called a depression? And above all, how do we free ourselves? Krugman pursues these questions, and declares that a strong recovery is just one step away, if our leaders can find the "intellectual clarity and political will" to end this depression now.