With a legacy of personal corruption we're still saddled with in Texas, "Great Society" programs that exploded the deficit while doing nothing to alleviate poverty, treasonous, pro-Viet Cong micromanagement of his war in SE Asia, plus the blood of ~58,000 Americans on his hands . . . and did NOTHING when the U.S.S. Pueblo was pirated by N. Korea. I don't see how Lyndon Johnson ended up anywhere but at the very bottom.
This determination makes about as much sense as awarding the Nobel Peace Price to a murderous terrorist like Yassir Arafat.
And Truman at #5? OK, he DID drop the bomb. But he's still the man who followed Roosevelt's lead and gave away Eastern Europe to Russia and later got us involved in Korea while continuing to provide aid and comfort to the Chicoms.
JFK? What the heck did he do besides take us to the brink of war with the Soviets? (Unless he got extra points for affairs with Marilyn Monroe and Angie Dickenson . . .?) Oh, that's right, I almost forgot - he sold out Cuban nationalists at the Bay of Pigs.
Carter is still 'way too high, considering a lot of today's problems with Moslem extremism can be laid at his doorstep, as can the fall of Rhodesia.