Milo Yiannopoulos is about to go mainstream Republican, sort of, grabbing himself a keynote address at the Conservative Political Action Conference next month. The Washington gathering, known as CPAC, is the premiere event for established conservatives. This year’s speakers include Vice President Mike Pence, Texas Sen. Ted Cruz, former presidential candidate Carly Fiorina and Wisconsin Gov. Scott Walker, as well as media personalities like Lou Dobbs and Mark Levin. None of the 60 or so confirmed speakers, though, will have more stage time than Yianoppoulos at this year’s event, which runs Feb. 22-25 at the Gaylord National Resort & Convention...