Paul Callan is a CNN legal analyst, a former New York homicide prosecutor and counsel to the New York law firm of Edelman & Edelman PC, focusing on wrongful conviction and civil rights cases. Follow him on Twitter @paulcallan. The opinions expressed in this commentary are his own. View more opinion on CNN.
(CNN)History will record that Joe Biden won Tuesday night’s debate by demonstrating one important thing: he is not senile.