Dan Cantor, New York Working Families Party; Jonathan Soros, Friends of Democracy super PAC; the power of poetry with Martin Espada.

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Anti-creationism activist Zack Kopplin; author Susan Jacoby discusses secularism.

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Screenwriter Tony Kushner talks about Abraham Lincoln.

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Anthony Leiserowitz, director of the Yale Project on Climate Change Communication.

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Economist Richard Wolff analyzes income equality; Sheila Bair, former chairperson of the Federal Deposit Insurance Corp.

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Bryan Stevenson, founder of Equal Justice Initiative, discusses the American justice system; an essay on the idea of justice for all.

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Historian Taylor Branch and theologian James Cone discuss Dr. Martin Luther King Jr.'s vision of economic justice.

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Economic inequality in California; writer Sherman Alexie.

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Activist Sandra Steingraber discusses protecting children from toxic trespassers contaminating air, water and food.

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Journalist Glenn Greenwald discusses the Boston Marathon bombings; political scholars Norman Ornstein and Thomas Mann.

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Francine Wheeler, whose son Ben was among the children killed at Sandy Hook Elementary School in Newtown, Conn., and singer Peter Yarrow, discuss the power of music to create change; David Wheeler talks about resolving the gun issue.

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Marshall Ganz, senior lecturer in public policy at Harvard University's Kennedy School of Government; Rachel Laforest, executive director of Right to the City and Madeline Janis, co-founder of Los Angeles Alliance for a New Economy.

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Public health historians David Rosner and Gerald Markowitz discuss the dangers of lead; Sheila Krumholz, executive director of the Center for Responsive Politics; Danielle Brian, Project on Government Oversight.

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Environmental activist Tim DeChristopher, co-founder of Peaceful Uprising; columnist Gretchen Morgenson.

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Economic inequality in California; writer Sherman Alexie.

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Economist Richard Wolff; activist Saru Jayaraman.

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Professor Lawrence Lessig, director of the Edmond J. Safra Center for Ethics at Harvard University.

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ALEC -- the American Legislative Exchange Council.

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Filmmaker Kristi Jacobson and Mariana Chilton, director of the Center for Hunger-Free Communities, discuss hunger in America; journalist Greg Kaufmann.

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First profiled 22 years ago, two American families in Wisconsin struggle to keep up with the changing U.S. economy; authors Barbara Miner and Barbara Garson.

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Columnist Marty Kaplan discusses economic inequality in the U.S.; historian Gary May.

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Tom Diaz discusses gun control; Baldemar Velásquez fights for the rights of farmworkers.

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Rep. John Lewis (D-Ga.) discusses his leadership role during the civil-rights movement of the 1960s.

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Director Kristi Jacobson and Mariana Chilton, director of the Center for Hunger-Free Communities, discuss hunger, food insecurity and poverty in America.

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Economist Richard Wolff; activist Saru Jayaraman.

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Marshall Ganz, senior lecturer at Harvard University's Kennedy School of Government; Rachel LaForest, executive director of Right to the City; Madeline Janis, co-founder of Los Angeles Alliance for a New Economy.

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Journalist and author Mark Leibovich discusses his views on Washington, D.C.

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Rep. John Lewis (D-Ga.) discusses the 1963 march for civil rights.

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Correspondent Deborah Amos, National Public Radio; historian Andrew Bacevich; guest host Phil Donahue.

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Davie Zirin, sports editor of The Nation.

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Former Secretary of Labor Robert Reich discusses the movie "Inequality for All," which examines income disparity in America.

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Kumi Naidoo, international executive director of Greenpeace.

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Writer Wendell Berry discusses the environment.

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Yale Law School professor Heather Gerken discusses McCutcheon v. Federal Election Commission; historian Joyce Appleby.

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British journalist Martin Wolf discusses the debt ceiling debate and its potential impact on the global economy; MIT professor Sherry Turkle.

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Financial journalist Gretchen Morgenson; historian Peter Dreier.

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Yves Smith, the Naked Capitalism blog; Dean Baker, co-director of the Center for Economic and Policy Research; a preview of "Unmanned: America's Drone Wars."

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John Nichols, The Nation; professor Robert McChesney.

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Dr. Jill Stein, co-founder of the Massachusetts Coalition for Healthy Communities; Dr. Margaret Flowers, Physicians for a National Health Program.

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Author Henry Giroux; remembering novelist Doris Lessing; the documentary "Birth of the Living Dead."

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Author and environmental activist Wendell Berry; short documentary "Dance of the Honey Bee."

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Mark Leibovich, The New York Times Magazine, discusses Washington's powerbrokers.

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Historian Richard Slotkin talks about guns and violence in America.

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Civil rights lawyer and legal scholar Michelle Alexander.

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Historian Thomas Cahill discusses Pope Francis and the relevance of the church in the 21st century.

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The battle of American politics rages on in North Carolina.

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