FILE - In this Oct. 25, 2012 file photo, former President Bill Clinton, second from left, stands with fellow democrats State Rep. Pete Gallego, D-Alpine, left, San Antonio Mayor Julian Castro, and U.S. congressional hopeful Joaquin Castro, right, during a campaign rally in San Antonio. Castro was seen as the Democratic star that could eventually rise to prominence in the deep red state of Texas. But with his party still years away from capitalizing on a demographic shift that could help Democrats compete for statewide power, the San Antonio mayor has opted instead to build his political clout in Washington as part of President Barack Obama’s Cabinet. (AP Photo/Eric Gay, File)