evidence: Obama carefully chose her words and rehearsed every phrase — including the ones that Melania Trump's speechwriter apologized Wednesday for borrowing — until she nearly knew them by heart. Working closely with her staff, Obama filled the speech with personal details designed to illuminate what she called her "improbable journey" while offering a vivid take on working-class Americans and her desire for a fairer, more tolerant society. [...] The sentence fragments borrowed by the Trump campaign and rendered anodyne by Melania Trump were central to Michelle Obama’s narrative. She spoke of her blue-collar parents, including her father, afflicted by multiple sclerosis, struggling to walk with two canes, rarely missing a shift at the Chicago water plant. She told of Barack Obama’s working-class grandparents and his mother’s time as a single parent.