Big Brother sees all. (Bloomberg) — Will St. Clair, wearing semi-rimless glasses, a plaid buttoned-down shirt, jeans and Adidas sneakers, can usually be found sitting on an exercise ball in the back of President Barack Obama’s campaign headquarters, his eyes trained on his computer screen. The 23-year-old’s job is a mystery even to some senior … Continue reading Obama Campaign Secretly Data Mining Voters: “Microlistening”…