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 While there is, no doubt, a way to correctly state the information about when a presidential term ends, this seems nowhere remotely close to relevant for the lead of the Obama article (and probably not anywhere in this article).  If readers are interested in the legal details of US presidential elections/terms, they can read plenty of linked articles directly on that topic.  We're not hiding that information.  On the other hand, how this pertains to Obama himself is just WP:CRYSTAL.  Maybe he'll resign, be impeached, or die (heaven forbid the last, and all).  Maybe he'll not run for second term.  Or maybe he'll run and lose.  Or maybe he'll win a second term.  Putting any such scenarios in the lead is in no way relevant to this biography.  Readers don't need speculations and probabilities. 
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