A very difficult question to answer. I have three picks:
John F. Kennedy
I have toured Gettysburg, seen a man re-enact President Lincoln and answer questions from the audience. Absolutely incredible. I so admired his honesty, and I would have loved to have known and met him. I also saw the place where he gave the Gettysburg Address.
I have toured Thomas Jefferson's home, an amazing experience. To quote author Saul K. Padover, who wrote a biography on Jefferson, "...Jefferson was a passionate champion of the rights, freedom and dignity of man. He devoted his whole life to the spread and realization of the democratic ideal. And today his words still glow and still inspire." - Saul K. Padover, "Jefferson A Great American's Life And Ideas"
I certainly would have loved to have known and met this great man also.
I remember the assassination of President Kennedy as if it were yesterday. I have it logged in my diary on that horrible day. He remains in my heart and mind as a man of integrity...and I believe he would have done so much more for our country, had he not been killed.
Blessings to all, Sparklea