Jeb Bush is steeling for a fight with the GOP’s conservative base, signaling he will not bend from his centrist positions on immigration and Common Core education standards in 2016 — even if it costs him support with grassroots conservatives. In what could be read as a swipe at 2012 GOP presidential nominee Mitt Romney, Bush told a Washington audience this week that “no one really knows” if a presidential candidate can survive the primaries without sacrificing his core principles because “it hasn’t been tried recently.” The former governor of Florida also told the CEO Council forum sponsored by The...