This year’s Pride March was an emotional and bittersweet mix of sorrow for the 49 victims of the Orlando nightclub shooting, defiant courage in the face of such hateful violence, and triumphant celebration of the newly designated Stonewall National Monument. The new group Gays Against Guns, or GAG, was out in force, staging die-ins and warning Orlando shooting-enabler Wayne LaPierre of the N.R.A. he better get ready to “GAG on it.” Hillary Clinton, the presumptive Democratic nominee for president, marched — but so did Babes for Bernie, a group of Bernie Sanders supporters.