 Carillo served on the Railroad Commission until 2011, when his elective term ended.He was a candidate for renomination in the statewide Republican primary election on March 2, 2010, but he was handily defeated by newcomer David J. Porter, an accountant from Giddings who received 732,892 votes (60.7 percent) to Carrillo's 474,096 (39.3 percent).In the November 2, 2010, general election, Porter then defeated the Democrat Jeff Weems, an oil-and-gas lawyer from Houston.