To me both LBJ and Nixon are ahead of Obama and Bush II. I think without Vietnam LBJ would have been ranked by historians as a near great president up there with Truman, Jefferson and Teddy Roosevelt. Nixon without Watergate, well look at what he did, He opened up Red China, I do not think any other president could have done that. He gave us the EPA, OSHA, the Endangered species Act, funds for education, revenue sharing, detente, and much more. For the life of me, this man governed like a liberal and perhaps was the most liberal president since FDR and hence, yet most people still call him a conservative. Why? Nixon was also all for Affirmative Action and did quite a lot on that scene too. Perhaps most people just can't get past the R and the D when it comes to labeling.
Both of us are pretty close to each other, but there are differences and I think that is because we place different emphasis on different things.
Just for the heck of it, here is mine from IKE to Obama and remember Obama is more of an incomplete and can rise and fall depending on what happens over the last three years of his presidency.
6. Bush I
8. Bush II
I would say Obama and Bush II are basically tied at this point for me. I think outside Libya when Obama refused to go to congress, I really like his foreign policy so far. Domestically, for me he hasn't been that hot.