1. The 2014 primary season is upon us, as voters in Arkansas, Georgia, Idaho, Kentucky, Oregon and Pennsylvania prepare to head to the polls for tomorrow's primaries. Robert Costa, National Political Reporter for The Washington Post, joins us.
2. Next up: Former New York Times Executive Editor Jill Abramson broke her silence for the first time since she was fired from the publication. We've got the scoop on what happens when the media covers itself. We'll discuss with Emily Bazelon, senior editor at Slate and contributing writer for The New York Times Magazine.
3. Then: The bob-and-weave that was Sen. Marco Rubio's answer to the question of whether he ever smoked marijuana.
4. Plus: The first installment of our special series, "All In America: On the Road in the Conservative Heartland," as we travel deep into the heart of 'Koch country:' Kansas. Mother Jones reporter Daniel Schulman, author of a new book, "Sons of Wichita: How the Koch Brothers Became America's Most Powerful and Private Dynasty," joins us.