Here’s an interesting tidbit that disqualifies Rudy Giuliani from the presidential race…
Rudy Giuliani received his honorary knighthood from Queen Elizabeth II in February of 2002.
Titles of nobility were prohibited by both Article VI of the Articles of Confederation (1777) and in Article I, Section 9 of the Constitution of the United States.
Article VI: […] nor shall any person holding any office of profit or trust under the United States, or any of them, accept any present, emolument, office or title of any kind whatever from any King, Prince or foreign State; nor shall the United States in Congress assembled, or any of them, grant any title of nobility.
Article I, Section 9: No Title of Nobility shall be granted by the United States: And no Person holding any Office of Profit or Trust under them, shall, without the Consent of the Congress, accept of any present, Emolument, Office, or Title, of any kind whatever, from any King, Prince or foreign State.
So, since Giuliani holds the title of “Sir” or “Knight” under both the Constitution and the Articles of Confederation he cannot hold “any office office of trust,” which includes the office of President.
Also of interest: http://www.dailykos.com/story/2007/7/10/155241/107