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Mrs. Clinton tells anyone who asks that she won’t be staying on if President Obama wins a second term — not surprising, given that only one secretary of state has served more than four years since the 1970s. And after a bruising fight with Mr. Obama for the 2008 Democratic presidential nomination, she likes to say she won’t be returning to the political stage.

But with her popularity at an all-time high and the Democrats in likely need of a 2016 candidate regardless of whether Mr. Obama is re-elected, there is widespread speculation that she would find a second stab at becoming first female president irresistible.

First, though, she’ll need a nap.