ATLANTA — LAST week Jennifer Mumaugh and A. J. McDaniel became the first same-sex couple to marry in Wyoming. They celebrated their union in Cheyenne, just miles away from where Matthew Shepard was left to die only 16 years ago. Wyoming thus became the 32nd state to allow gay marriage — explicitly or, by refusing to appeal court decisions, implicitly. Alaska. Arizona. Idaho. All have fallen this month.