Mr. Constitution Hour by Douglas V. Gibbs: The debate between Donald Trump and Joe Biden left Biden's last remaining supporters stupified, with the Democratic Party clamoring for a replacement; and everyone has been mentioned except the Vice President, Kamala Harris.  Why is that?  Also, the Democrats are doubling down on their determination to fundamentally transform America.  And, the Supreme Court of the United States took a case regarding social media and federal influence on their censorship policies.  Mr. Constitution explains.