That being said I also am aware that "Mr. Davis" doesn't get listed on any Presidential list these days but he too was a President and I have often seem him reffered to as "Mr. Davis" in books and forums etc.
Does anybody think I'm reading too much into this? I have no problem saying President Lincoln because there is no doubt he was President of the U.S. I just wish President Davis was shown the same courtesy.
P.S.... During our Revolutionary War nobody seems to have reffered to King George as "Mr. George." But... I bet they had some choice names for him too :-)