The President of the United States not only leads the Executive branch of our government, the President is the face of America to the rest of the world. This fact should influence who we choose as our elected leader.
Like it or not, being President is partially about stage presence. Ronald Regan's experience as an actor helped him quite a bit with delivering speeches in a forceful but constructive and influential manner. These same qualities would serve Fred Thompson well, but I personally don't believe he is the best choice.
Also, like it or not, most of the rest of the world is still an "old boys club". Considering the current geopolitical climate and the world leaders that will be major players, sending a woman, no matter how qualified, to the White House may not be our best play. I firmly believe that there are women qualified to serve as President - Hillary is not one of them. However, considering the global chess game that we will be playing, a woman will not be taken seriously by most of our adversaries. Is it fair that a women will not be taken seriously? No, but it's reality.
Whatever your party affiliation or political orientation, you should consider all of the roles the President will need to play when making your final decision next November.
Based upon the all the roles a President must play and the current slate of candidates, I would have to say the best Dem choice is John Edwards and the best Rep choice is Mitt Romney. However, injecting my personal bias for changes in Taxation, enforcement of Immigration Law, and upholding the Constitution my choice is Mike Huckabee.
##That's my opinion##