Nor do I but I always try to be accurate:
http://www.cbsnews.com/stories/2009/01/16/opinion/polls/main4728399.shtml
From your SeeBS link:
In November 2008, just before the presidential election, only 20 percent approved of the job he was doing as president - the lowest of any president since Gallup began asking the question in 1938
they have yet another number for the nadir. It was low. It was very low. I’ll go with that.