Because it doesn't include Obama, you mean? The mnemonic is based on using syllables to denote the number of terms each president was in office, so it'd be sorta hard to work him into it at present...
Well, you'd only need to add one syllable for now. But since he never plays it live (and he mentioned somewhere that he's unlikely to rerecord The Presidents, although he does sing an updated version of it live) it doesn't really matter.
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