School trips to Washington, D.C., are a much-anticipated ritual for students nationwide. Hordes of teens flow through the nation’s capital throughout the year to visit the wide variety of museums and the key bodies of the republic the city has to offer. Buying souvenirs commemorating the trip is another honored tradition, and local shops say the teens know what they want when they descend on the businesses-Trump merchandise. The Washington Post reports: Back at I Love DC Gifts, Khalid Ismail said the best-selling item is a cherry blossom sweatshirt that says “Good Vibes.” Even in June — months after the...