Joe Biden cannot be the Democratic nominee

Joe Biden is a rapist.

Also he is not healthy enough to be president.
Arteriosclerosis probably causes Biden's dementia as well as his subconjunctival hemorrhages.
Arteriosclerotic dementia (also called vascular dementia) is when damaged blood vessels reduce the blood supply to the brain, limiting the amount of oxygen and nutrients needed for the brain to function properly. ... Vascular dementia is the second most common cause of dementia among older people.

Subconjunctival hemorrhage is a benign disorder that is a common cause of acute ocular redness. The major risk factors include trauma and contact lens usage in younger patients, whereas among the elderly, systemic vascular diseases such as hypertension, diabetes, and arteriosclerosis are more common.