" Since approval ratings are numbers, his number is either the lowest, or it's not. It doesn't really make sense to say he's only one to have received that number, since you would expect a unique number for each person. Among all US presidents, Bush's approval rating is the lowest ever recorded.
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Goodman
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Among all the presidents in recent history, Bush is the only one who has received the lowest approval rating. This doesn't work for me if the scores are numerical. Only one person can have the lowest. If there are grades, so that several people could have received the lowest grade (but none did except him), this works. If he got a 22