They may well be the future of their parties — Rubio, the Cuban-American Republican, is 41; Castro, the Mexican-American Democrat, 37. In their speeches — hyped relentlessly before and after the fact — they drew on stories of their immigrant families. This is the reality of the magic act we saw: Both parties are trying to claim the hearts of Latino voters. This is the deception behind the magic: Both parties are breaking Latino hearts when it comes to immigration.