The Castros say they’ll work to beat Donald Trump, but their support for Joe Biden has been restrained

Neither Julián Castro, the former U.S. housing secretary and mayor of San Antonio, nor U.S. Rep. Joaquin Castro has formally endorsed Joe Biden.REUTERS/Callaghan O'HareAs the general election for president has come into focus, there has been no doubt whom the Castro brothers will support.Julián Castro, the former U.S. housing secretary and mayor of San Antonio, reiterated that again this week.“Everybody understands that the No. 1 goal has to be to replace this president,&rdq