Trump has enjoyed a consistent lead in swing states, notwithstanding his horribleness, his outrageous conduct and rhetoric. A poor performance tonight wouldn’t matter.
In contrast, President Biden is perceived as too old and lacking in capacity to fulfill a second term. Biden has to show great command, confidence, and mental agility tonight, just to have a chance.
That is, Biden needs to appear as a seasoned and highly capable lawyer before a jury. Someone who still delivers his A game.
Anything less, stick a fork in Biden.