Castro ran for mayor of San Antonio again in 2009. Castro hired Christian Archer, who had run Hardberger's campaign in 2005, to run his own 2009 campaign. Castro won the election on May 9, 2009 with 56.23% of the vote, his closest opponent being Trish DeBerry-Mejia. He became the fifth Latino mayor in the history of San Antonio. He was the youngest mayor of a top-50 American city. Castro easily won re-election in 2011 and 2013, receiving 82.9% of the vote in 2011 and 67% of the vote in 2013.