Hollywood insiders had a field day on Sunday as the 70th Golden Globes turned into a feast of smart-mouthed humor aimed at two of their favorite subjects: politics and themselves. The night’s big prize, for best motion picture drama, went to “Argo,” a reality-based thriller about the rescue of American diplomats from Iran during its revolution. But the prizes were just half the action, as the room was kept spinning by Amy Poehler and Tina Fey, hosts who pulled no punches.