con: one might get elected just because she is female and not because she is the right person for the job.
con: some men are still unable to deal with women as equals.
con: any decision she makes will be scrutinized as to whether hormones were involved, a situation men have not had to deal with even though they are flooded with testosterone - a hormone of aggression.
pro: women don't have the testosterone overflow that pushes aggression so they can be more level-headed
pro: a woman might come up with different approach to all things
pro: a less destructive but far more successful means of fighting wars