ES MOINES, Iowa — Five-point plans, engaging speeches and star endorsements are all important in a presidential campaign, but how well do candidates REALLY know the cities and towns where they're wooing voters? The supreme test in Philadelphia: ordering a cheesesteak. Just ask Secretary of State John Kerry, who was roundly mocked in 2003 for passing up the more traditional Cheez Whiz on his cheesesteak for Swiss cheese. "Don't come into Philadelphia and try to cater favor with us and then order Swiss cheese, which no one does in Philadelphia," Ed Rendell, former Pennsylvania governor and Philadelphia mayor, said. Hillary...