The Strange Influence of Polls. A Vatican Secret Plot Against Hitler.

Pope Pius XII blesses a group of war correspondents in the Vatican, shortly after the liberation of Rome during World War II, 7th June 1944

New Yorker staff writer Jill Lepore reveals that the influence of polls is rising, even if they may not be very effective. Director Bernardo Ruiz talks about documenting the U.S.-Mexico drug trade in his new film, "Kingdom of Shadows." Author Lauren Groff looks at the many sides of a marriage in her latest novel. Plus, Pope Pius XII's secret stance against Hitler, as told in a new book by Mark Riebling.