Mr. Rubio is the first Spanish-speaking Hispanic to run for the White House. While his appeal may be stronger in the Cuban-American community, he will attempt to draw support from the broader Latino community by campaigning in Spanish. That could be significant given that 25m Latinos — 11 per cent of the electorate — are now eligible to vote, an increase of 3.9m over the past four years. On Monday night he quoted his father saying “En este pais, ustedes van a poder lograr todas las cosas que nosotros no pudimos” — “In this country, you will achieve all the t...