Rick Santorum dropped out of the race earlier this week, leaving Mitt Romney the presumptive nominee for the Republican Party. This morning Chris cataloged Mitt Romney's "extreme and/or horrible... policy commitments" and how Chris expects him to begin pivoting to the middle. Plus, guest Mark Bittman returned for more discussion about the latest developments in the world of food politics. And we talked about the national polarization machine in the wake of George Zimmerman's arrest for the shooting death of Trayvon Martin.

Joining Chris were:

Michael Eric Dyson (@michaeledyson), MSNBC political analyst and professor at Georgetown University.

Mark Bittman (@bittman), food columnist at the The New York Times.

Kerry Picket (@kerrypicket), writer for the The Washington Times opinion page.

Amanda Terkel (@aterkel), managing editor and senior political reporter for politics at the The Huffington Post.

Gary Younge (@garyyounge), columnist for The Guardian and The Nation.

:: Blogged by Brett Brownell (@brettbrownell), Up w/ Chris Hayes web & video producer ::

In discussing the latest developments on the killing of Trayvon Martin, the Up w/ Chris Hayes panelists highlight the racial polarization surrounding the case.

The Up w/ Chris Hayes panelists talk about the extreme views on race that have surfaced following Trayvon Martin's death.

On Saturday Chris featured Mike Daisey's factual distortions as his Story of the Week. Plus, Chris and his guests discussed the tragic shooting death of Trayvon Martin, the impact of Stand Your Ground gun laws, Occupy Wall Street's Spring rebirth, and what we know now that we didn't know last week.

-Brett Brownell (@brettbrownell) is video and web producer for Up w/ Chris Hayes which airs Saturday and Sunday mornings on MSNBC.

It's a story everyone's familiar with by now:17-year-old Trayvon Martin was shot and killed within a gated community in Sanford, Florida. His shooter, 28-year-old George Zimmerman, was never arrested or charged with a crime. The Up w/ Chris Hayes panel - including the Atlantic's Ta-Nehisi Coates, The Nation's Liliana Segura, the Bernard Center's Michelle Bernard, and former police officer Peter Moskos - discuss the case in detail and the national cause it has become.