In the case of Elizabeth I, she was the queen at a time when her role was more than merely constitutional. She had a great deal more actual power than her namesake, but I have read that she believed that her role as leader meant serving her subjects (he that would be chief among you shall be servant of all). In both the cases of Elizabeth I and Joan of Arc, you have women who sacrificed the feminine side of their personalities to fulfill the destiny they believed God had called them to (i.e. neither one of them ever married or had children). In the cases of Victoria and Elizabeth 2, you have women whose roles in the world put them in positions of authority over their husbands (for example they are required to swear oaths of loyalty to them, walk several steps behind them on state occasions, etc.), but each of them were married to men who expected to be in charge of their own households, to wear the pants in the family, so to speak. And, yes doojable, the royal family continues by bloodline not election.
I'm not sure that a female president needs any other qualities to be successful than a man does; i.e. intelligence, a good education, natural leadership abilities, good political savvy, and, possibly most important of all, a good set of advisors.
And BTW, rascal, stop picking on my husband.