It was a bit of a surprise when federal agents raided the compound owned by Atlanta Falcons quarterback Michael Vick in Surry County, Va., last week and took over an investigation into allegations of dogfighting. Even the local authorities in Surry who've been conducting their own probe were stunned by the federal action. Commonwealth's Attorney Gerald Poindexter said, "I'm amazed, to be quite honest." The government's action raises questions. Here are some answers . . . Federal investigators have been scouring Michael Vick's property in rural Virginia looking for evidence of dogfighting. What's going on? And how did the U.S....