His twin brother is Congressman Joaquin Castro. Julian Castro was considered a potential running mate for Hillary Clinton in her 2016 presidential campaign. In January 2019 he launched his campaign for the Democratic nomination for the 2020 election for President of the United States. If elected he would become the third youngest President. According to his 2014 Congressional finance disclosure, Julian’s net worth was $587,000. He earned $100-250,000 from an book advance and has around $100,000 in his cash/checking accounts.