How did this happen? How did the nation go in an instant from disbelieving every utterance of Donald Trump to robotically repeating — and acting on — every claim that falls out of Joe Biden’s mouth, no matter how disconnected from the truth? The most glaring example involves Biden’s fact-challenged tirade against Georgia’s new voting law. At his first and only press conference, Biden declared the state’s efforts to protect against voter fraud were worse than Jim Crow, “un-American,” “sick,” and “despicable.” (This was the same press conference where moments later Biden bragged about how much time he’s spent with...