COLUMBUS, Ohio -- The National Rifle Association announced Monday that it would not hold its 2007 national convention in Columbus as planned. The announcement came one week after City Council passed an assault weapons ban, NBC 4's Kyle Anderson reported. NRA officials said the group would return once the state legislature enacts a pre-emption that would overturn the Columbus ban, Anderson reported. Local convention officials said the three-day convention would have brought 60,000 people and $15 million to the local economy. The officials had hoped the speculation would not prove true, and as of late last week said it had...