The walls of San Diego have been known for Wyland's whales and Chicano murals. But as of this weekend, some of the world's most prolific street artists will be adding their work to our urban environment. It's all part of the Museum of Contemporary Art San Diego's new exhibit, "Viva la Revolución: A Dialogue with the Urban Landscape." We'll talk with the show's curator, along with Shepard Fairey, the artist behind the Obama Hope poster and Obey Giant, and French street artist, JR.