Biden has virtually no energy. I thought Hillary didn't have energy... holy man.. Biden REALLY doesn't have energy. He can't get through a speech, looks confused at where he is, etc.
No one is actually excited about Biden
Trump is going (and already is) to associate tearing down statues of presidents, defunding the police, CHAD, riots on Biden and Democrats as a whole (and rightly so). Independents as a whole are NOT fond of any of those events.
Trump is the incumbent, which adds at least a little bit to his edge
Trump will eviscerate Biden in the debates. Biden will look weak and confused going against Trump.
---
"Sometimes you will never know the value of a moment until it becomes a memory." - Dr Seuss