INDIANAPOLIS — Former Alaska Gov. Sarah Palin fired up a crowd of thousands inside Lucas Oil Stadium Saturday night to kick off the National Rifle Association’s “Stand and Fight Rally,” saying Americans’ constitutional rights as envisioned by the founding fathers are under attack and policies like gun-free zones constitute “stupid on steroids.” “They knew that if the Second Amendment goes, the rest of the constitution is not far behind,” she said of the country’s founders. In her approximately 12-minute address, Mrs. Palin also derided what she argued is akin to a ‘blame the messenger’ attitude on gun violence many Americans...