State Rep. Robert “Renny” Cushing, who staged a massive sit-in against nuclear power in the 1970s and spent later decades standing up for social justice at the Statehouse, has died. He was 69. Cushing, D-Hampton, who had been fighting stage 4 prostate cancer, died Monday at his home, the House Democratic office announced. Even as his illness progressed, he was elected House Democratic leader in late 2020, and told his colleagues he would focus on finding common ground in the fight for the common good. First elected to the House in 1996, Cushing was serving his eighth non-consecutive term in Concord, where he was known for pushing progressive causes. He spent more than 20 years trying to repeal the state’s death penalty law, finally achieving victory in 2019 when lawmakers overrode a veto by Republican Gov. Chris Sununu.