2020 presidential candidate Julián Castro still believes in the American dream. The former Secretary of Housing and Urban Development under President Obama sat down with Salon's D. Watkins on "Salon Talks" to discuss why he is exploring a run for the presidency in 2020 and his new memoir, ["An Unlikely Journey: Waking Up from My American Dream,"]( http://www.amazon.com/dp/dp/0316252166/?tag=saloncom08-20), available now. Castro, also the former mayor of San Antonio, shares why he is optimistic about the American dream and the "ability to be successful as you define that." To hear more from Julián Castro, watch his "Salon Talks" episode with D. Watkins.