I travel to Mexico on business regularly, and had the opportunity recently to drive across the border with a coworker who is a flaming liberal. This was her first time in Mexico, and she was astonished to discover there is actually a wall separating Mexico and the US in or near populated areas. Her initial reaction was, "How come we've already started building Trump's wall? He's not the President yet." I 'splained it to her. Slowly. Had to repeat myself more than once. We crossed the border into Mexico without showing any documents, and she asked where the border crossing and immigration was. I had to explain that Mexico doesn't stop anyone from the US crossing the border. It's open in this direction, with a quick visual as we pass by. No stopping. No paperwork. "Anyone can just come here? No ID or passport needed?" She asked, eyes wide. "Yes," I 'splained again. "They have an open border policy." We spent several days in Mexicali, where we witnessed armored vehicles traveling the streets in caravans, cars with their windows smashed out parked alongside the main roads during the day, and were told by our hosts not to leave the hotel to go exploring without a local guide to keep us away from the bad areas or restaurants. When we left, the border crossing was quick and painless. The guard took our passports, checked that everyone in the car matched their picture, and we were back in the US. She was quiet most of the way to San Diego, when she finally asked me, "When will the rest of the wall be finished, and will they build that one in town up higher?" "I thought you were all for an open border with Mexico. What changed?" "No one would live back there by choice," she said quietly, "and I don't want all those hoodlums coming here." "Voting for Trump are you?" I asked. No reply.