I like the idea of Xavier Beccera being the VP choice; he's Latino, and though he's 58 or so, he looks quite young, and has a lot more experience in elections than Castro. Plus he speaks Spanish, which I don't think Julian Castro does.
Well, if Castro does not even speak Spanish, I fail to see any logic in his selection.
He really does not have the political heft required of a Vice Presidential candidate in this day and age, and if he does not speak Spanish, he would not be of any use at all to the ticket.
I would think that he does speak Spanish though.