If you could magically be a world-class expert on one US president, who would it be?

[Lemon Drop]

What is your measurement for "ranking" the presidents?

I think once you're one of the 44 men who have been President of the United States, you're already pretty darned remarkable.

I find the earlier ones more interesting because they had so little precedent for the job they were doing, and at that time the country changed so rapidly.