I do not believe we need to encourage his candidacy.  And, I'm sorry, but I live in America, where English is still the language of the majority.  To deliver a major speech in a foreign language is unacceptable.  To do so for part of the time, or as merely a translation would certainly be fine, but if he wants to lay out his plans for four years of leading this country, let him do it in English, or else go run for President in Mexico or Spain or another South American country.