As the United States approaches its 250th birthday, conversations about the durability — and limits — of the Constitution are intensifying. On Wednesday, June 24, the Vail Symposium, as part of its America 250 programming, presents “Modernizing the Constitution: Conversations on Controversial Issues,” a timely program moderated by humanities scholar Clay Jenkinson and scholars Beau Breslin and Sanford Levinson, that asks whether an 18th‑century …