Julián Castro heading to Iowa

Castro, a fast-rising star within the party who gained prominence with his keynote speech at the 2012 Democratic National Convention, will headline a fundraiser hosted by Sen. Tom HarkinTom HarkinGrassley challenger no stranger to defying odds Clinton ally stands between Sanders and chairmanship dream Do candidates care about our health or just how much it costs? MORE (D-Iowa), according to the Des Moines Register.

Castro's well-received speech helped give him a national platform, and he's been a vocal supporter of immigration reform. Though Castro has ruled out a run for the presidency in 2016, his office touted a poll showing him as a popular choice to be vice president earlier this summer.