Football coaches face a tough choice anytime they’re asked to play politics: Do so, and they risk alienating their fan base for a reason other than play calling or defensive schemes. Baltimore Ravens coach John Harbaugh took the plunge Saturday, when he agreed with Donald Trump’s idea to build a border fence to keep out illegal immigrants coming from Mexico. At an otherwise boring press conference Saturday afternoon, Harbaugh, who’s won a Super Bowl and is no stranger to dealing with media, was asked a question about officiating during the ongoing NFL preseason. Somehow, his answer drifted into politics, with...