What do you believe are aspects of physical, mental, intellectual shortcomings should exclude a potential candidate for being elected president of the US?

Blindness?
Marital status?
Allergies?
Be as specific as you want.

This question is partner to my other current question. I have the same restrictions here.

I would add this one other as stipulations, but not make it a requirement.
Please try to refrain from commenting on other replies until it appears most have had an opportunity to compile their lists without suggestions being already present.
My ideal time frame would be four days’ wait before ripping new ones.