Can a person who needs help with basic life activities be President?

Hillary's emails have been very telling...

If I were to approach a person on the street and list off traits like “doesn’t drive,” “needs food prepared,” “needs help with the remote control,” “needs people to bring her beverages,” “has trouble remembering things,” and “doesn’t pay her own bills” about someone anonymously, he wouldn’t think I was referring to a current presidential front-runner in the year 2015. He would think I was referring to his poor nana, whom he had to place in a home because she wouldn’t stop yelling at the lamp and was at risk of accidentally microwaving her dentures. But, as we now know courtesy of the ongoing FOIA e-mail dump, all of these traits accurately describe the current Democratic front-runner and (as she is always eager to remind us) doting grandmother, Hillary Clinton. Amidst the e-mail revelations, an alarming pattern is developing about Clinton’s personal dependency on those inside her inner bubble. She isn’t just delegating important tasks to underlings, as any executive might; these aren’t urgent matters of national security, such as aides’ fetching satellite intelligence or the latest reports relevant to a managing executive. Rather, it appears that Hillary is either helpless or unwilling to perform even the most menial and trivial of daily tasks.