As George Zimmerman's supporters work to stem the rising tide of public outrage aimed at the neighborhood watchman who shot and killed Florida teenager Trayvon Martin last month, a new picture of the victim—culled from the 17-year-old's Facebook and Twitter accounts and witness testimony—has emerged. "With a single punch," the Orlando Sentinel, citing police sources, reported Monday, "Trayvon Martin decked the Neighborhood Watch volunteer ... climbed on top of [him] and slammed his head into the...