AMERICUS, Ga.— Over the past three decades, as the state around him turned ever more resolutely Republican, W. McCall Calhoun Jr. remained an outspoken and unwavering liberal. He gave money to Democrats, ran for office as a Democrat and zealously championed Democratic policies in social circles that were far from sympathetic. If friends admitted they voted for Donald J. Trump, his reaction could be blistering. “He was hard core, there’s no doubt...