Progressives, socialists and Bernie Bros are gearing up for war should Joe Biden fall short of his quest to unseat President Trump in Tuesday’s election. “You would see a complete repudiation of the Democratic establishment as we know it,” said Jabari Brisport, 33, a Democratic Socialist-backed candidate for state Senate expected to easily win a Brooklyn seat next week. “The Democratic establishment is not working for everyday people.” Brisport said a Biden loss would completely discredit the moderate wing of the party, paving the way for more successful insurgents like himself. “It’s going to be the mirror image of what...