President class="mandelbrot_refrag"> Barack Obama elevated fast-rising Latino politician Julian Castro to the national stage on Friday, nominating the San Antonio mayor as the next secretary of housing and urban development. The move automatically puts the 39-year-old Mexican-American in the mix of speculation about who might be the Democrats' vice presidential nominee in 2016. Obama picked Castro to fill the position that will be left by current HUD Secretary Shaun Donovan, who Obama nominated as the next White House budget director. true The Castro appointment is tantalizing politically because it brings a youthful Latino with star power to Washington. Castro and his twin brother, Democratic Congressman Joaquin Castro, rose from humble roots. Their grandmother worked as a maid, cook and babysitter to have enough money to help raise a family. "To be your nominee, class="mandelbrot_refrag"> President Obama , is simply a blessing to m