Commentary PITTSBURGH—They’re still there, planted in front of stately homes in wealthy suburban neighborhoods, on flagpoles in middle-class communities, and along the front stoops of inner-city row houses. Whether they say “Trump 2020” or simply “Trump,” there are plenty of people who have left their sentiments planted on their own personal hill. It is not just here in Pennsylvania. The signs are not hard to spot as you travel to the Great Lakes, the Midwest, and Appalachia. The reason is complex. People who come from a variety of socioeconomic, religious, and political experiences formed a conservative populist coalition long before Donald Trump descended Trump Tower’s escalator in June 2015 in New York City. Political analysts, who often have little cultural connection to Republican voters, tend to say “Trump the man” is why his supporters voted for him. So, using that same line of thinking, if they came here and saw …