What does Valerie Jarrett do? Robert Draper (of the scathing Donald Rumsfeld expose) spills 8,000 words of ink on Jarrett for this weekend's NEW YORK TIMES MAGAZINE, in search of that very idea. He tells a lot of great stories about Jarrett's influence with President Barack Obama, stretching back to the glory days in Chicago's Hyde Park, before their close-knit group of friends and power brokers could ever dream of running the country.