** FILE ** President Barack Obama's visits with Texas State Rep. Joaquin Castro (D), his twin brother San Antonio Mayor Julian Castro and Congressman Charles Gonzalez, from left, upon his arrival Tuesday, July 17, 2012 in San Antonio. (AP Photo/Bahram Mark Sobhani)

Photo by: Bahram Mark Sobhani

** FILE ** President Barack Obama's visits with Texas State Rep. Joaquin Castro (D), his twin brother San Antonio Mayor Julian Castro and Congressman Charles Gonzalez, from left, upon his arrival Tuesday, July 17, 2012 in San Antonio. (AP Photo/Bahram Mark Sobhani)