Joe Biden is bullish on his chances against Donald Trump in November — both in public and in private. But the mood among top Democratic operatives is decidedly different. “… Anxiety has morphed into palpable trepidation, according to more than a dozen party leaders and operatives. And the gap between what Democrats will say on TV or in print, and what they’ll text their friends, has only grown as worries have surged about Biden’s prospects,” reads a new report from POLITICO: “You don’t want to be that guy who is on the record saying we’re doomed, or the campaign’s bad or Biden’s making mista…