If Mitt Romney is the answer, what is the question? We can think of a few worthy possibilities, though one that doesn’t come immediately to mind is who would be the best Republican presidential nominee in 2016.

Mr. Romney told donors last week he is mulling a third run for the White House, confirming cheering whispers from his coterie of advisers. The question the former Massachusetts Governor will have to answer is why he would be a better candidate than he was in 2012.

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