When he's mad, President Barack Obama gets eerily quiet. A 21-year-old former Duke University football and basketball star improbably became then-Senator Obama's right-hand man during his first presidential campaign. Reggie Love went on to work as Obama's personal aide for five years, crisscrossing the nation with America's future president, serving him meals, carrying around his luggage, buying him clothes, challenging him on the basketball court, and babysitting for his children. In a new memoir, "Power Forward: My Presidential Education," Love discusses being by Obama's side "on the campaign trail when no one believed in him" to the "seconds before stepping...