(CNN) -- Democratic leaders took the initiative Monday to go after one of their own, U.S. Rep. Anthony Weiner, hours after he admitted to lying about posting an explicit photo on his Twitter account and carrying on inappropriate relationships with women he'd met online. [SNIP] One question that is sure to be central to such an investigation is whether Weiner used congressional resources while sending -- as he admitted -- explicit photos and messages to "about six women" over a three-year period. The New York Democrat claimed that his BlackBerry device is not paid for by the government, and added,...