I think that you're wrong. Lincoln was a great POTUS, IMO the greatest, while BHO2 will likely rank among the least influential.
On March 4, 1861, Lincoln took the Oath of Office; "I do solemnly swear (or affirm) that I will faithfully execute the office of President of the United States, and will to the best of my ability, preserve, protect and defend the Constitution of the United States.". I would opine that preserving, protecting, and defending the Constitution included defending the Union against armed insurrection.
Of course, I could be biased since my ancestor, Salmon P. Chase, served as the Secretary of the Treasury in Lincoln's Cabinet and later, as the Chief Justice of the SCOTUS, he administered the Oath of Office to Lincoln, Johnson, and Grant (x2)
No worse man in history has been venerated more.
And you can't protect and serve the Constitution by wiping your ass with it.
