Mitt Romney‘s seemingly nonstop hospitality tour of the 2016 presidential field took him to Maine on Monday. After hosting Gov. Chris Christie of New Jersey and Senator Marco Rubio of Florida and their families at his home in New Hampshire over the weekend, Mitt Romney and his wife, Ann, dined with Jeb Bush and his wife, Columba, in Kennebunkport, Me. The meal was at Walkers Point, the home where Mr. Bush’s mother and father, George H.W and Barbara Bush, reside. Both the former president and first lady attended the Romney luncheon, which was in the dining room of the main...