Eighteen million people watched the premiere of the “Roseanne” reboot. Like its showrunner Roseanne Barr -- the lead character, Roseanne Conner, is loud, volatile, and political. She’s a Trump supporter. President Trump called Barr after the first show to congratulate her. Meanwhile, her sitcom sister, Jackie, opposes Trump. Is this show good for discussing political divides or is it deepening them?