Actually, if I recall correctly, DemPGH (Unfairly! He was ultimately vindicated) had an approval rating even lower than WB after the Thursday Night Massacre, reaching some ungodly level like 8-9% in one poll.
Well, he wasn't. Attempts at silly historical revisionism aside, SirNick being awful doesn't excuse DemPGH being incompetent and leading us to ruin and civil war, and alongside Tyrion more than deserves a place amongst "worst Presidents" ever.
(That aside I think the actual record belongs to "Napoleon", who once polled 11%)