Some Republicans think that to win over the Latino vote, we must nominate a person of Hispanic origin. The Democrats too will need a new candidate. Remember the young skinny guy who spoke in Boston at the Democratic Convention five years ago? Young, dark-skinned, well spoken; and unknown. He is now in the White House. Remember the 2012 Democratic Convention? A young skinny guy spoke there. Young, dark-skinned, well spoken and unknown. His name: Julian Castro, Mayor of the city of San Antonio. Think.