FDR
And after him, Lyndon Johnson would be on my list. Vietnam was terrible, but I feel that his domestic achievements outweigh the war.
For the most part, they weren't. Maybe by today's standards, but most of them were very progressive on racial issues by the standards of their own times.
Lincoln gets knocked a lot for supporting colonization, but such a position was very common among abolitionists who felt that former slaves had been victimized for so long in America that the obstacles to their success would be too great to remain.
Jefferson owned slaves and may have even held some racist views toward blacks, but the evidence shows he struggled over the issue of slavery much more than a simple glance suggests. His main internal conflict was with his own status as a slaveholder and his recognition of slaves as human (even if they were inferior.)
This page is a good one on the subject of Jefferson and race.
Washington, like Jefferson, was a slave owner, but he personally held some anti-slavery sentiments and even added manumission of all his slaves into his will.
Teddy Roosevelt, on the other hand, was an outspoken supporter of black civil rights and even invited Booker T. Washington to the White House, a move that prompted Democrats to attack him for "painting the White House black."
