Melania and Donald Trump at his MSG rally. Photo: Photo by ANGELA WEISS/AFP via Getty Images If Michelle Obama , Ann Romney, or Jill Biden spent the final weeks of a presidential election introducing their spouse at campaign rallies, giving fluffy cable-news interviews, and promoting their (almost certainly ghostwritten) book, this would be totally unremarkable. Indeed, Doug Emhoff has been relentlessly performing all of these political - spouse tasks (except for plugging a memoir), and you

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