Former
Secretary of Housing and Urban Development Julián Castro is backing Sen.
Elizabeth Warren (D-Mass.). In doing so, he became the most well-known former
Democratic candidate to throw his name behind someone still in the running.
It's not a shocker — Castro, who dropped out of the Democratic presidential race last week, always spoke highly of Warren and never challenged her during the primary — but Warren received the news warmly.
Castro never became a serious contender during his campaign, but some analysts think his endorsement could be valuable for Warren, in part because of his heavy focus on immigration and criminal justice.