RICHMOND, Va. — An appeals court’s decision to strike down Virginia’s same-sex marriage ban adds to the growing list of decrees on a hot-button issue that will likely end up being decided by the U.S. Supreme Court. The 4th U.S. Circuit Court of Appeals in Richmond, Va., is the second federal appellate court to overturn gay marriage bans, after the Denver circuit, and is the first to affect the South, a region where the rising tide of rulings favoring marriage equality is testing concepts of states …