Joe Biden’s campaign doubled down on the candidate going on offense against a reporter after he asked if Biden has submitted to a cognitive assessment. Axios reported an unnamed Biden campaign official said in response, “It was a preposterous question deserving of a response that showed the absurdity of it all.” Earlier in the day, Biden made an appearance with the National Association of Black Journalists, and Errol Barnett asked if the presumptive Democrat nominee has undergone a mental exam. “No, I haven’t taken a test! Why the hell would I take a test? C’mon, man!” Biden lashed out. Biden...