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Julián Castro speaks at the start of the general session at the Texas Democratic Convention in Fort Worth, Texas, on June 22, 2018. Texas has long been a pipeline for Republican presidential candidates like nowhere in the nation. But it's two of the state's rising stars from the other party who look poised to take 2020 shots at the White House. Former San Antonio Mayor Julian Castro says he's likely to run, while Congressman Beto O'Rourke has done an about-face and isn't ruling one out a bid either, after nearly upsetting Republican Ted Cruz in a Senate race that became highly-watched nationally. (AP Photo/Richard W. Rodriguez)