WASHINGTON — In the first presidential debate, Republican Donald Trump skimmed over the January 6, 2021, attack at the Capitol, shifted blame for the violent mob siege and declined repeatedly to state unequivocally that he will accept the results of this year’s White House election. And President Joe Biden, who has said the work of his presidency is to restore the soul of the nation, flubbed and floundered, failing to forcefully confront, contradict and hold Trump, the indicted former president, accountable for the attack on the election — and democracy. It is an extraordinary moment, or lack of one, that ismore