As a country can we really afford to take the risk of having someone in office that has a 75% chance of experiencing all of these symptoms every month for 4 years? That's 48 weeks of their term=almost a year.
"I'm not going to make my inaugural address--I'm bloated."
"The Prime Minster hurt my feelings. I'm locking myself in the oval office until he can come up with a proper apology."
"Why is that congressman looking at me like that? What does it mean?"
"I'm calling in all of the leaders in the middle east for a slumber party and we're going to talk about our feelings and cry."
"Dear China, I'm sorry about that missile launch on your country last week. PMS!"
The president can't lock them self away for 5-7 days every month. A crisis could happen at any time and we need a person that is emotionally up for the task. I realize that not all women experience all of the symptoms of PMS and even if they do, it doesn't necessarily happen every time but the risk is there and I'm not willing to take it!