 A pair of Democratic senators with "A" ratings from the National Rifle Association said Monday they would be open to greater regulation of assault rifles. Sens. Mark Warner (Va.) and Joe Manchin (W.Va.) said Friday's mass shooting in Connecticut changed their perspectives. "Never before have we seen our babies slaughtered," Manchin said. "Anybody that's a proud gun owner, anybody that's a proud member of the NRA, we're also proud parents. We're also proud grandparents."