pledged to consider reintroducing an assault weapons ban on sales of semiautomatic rifles and receipts trictions on certain ammunition. many firearm enthusiasts fear those new laws many fir many firearm enthusiasts fear those new laws and are voting shth their pocketbooks. at a denver gun show this weekend, ammunition for the ar- 15 semiautomatic rifle, the style of weapon used in the newtown attack, sold out within an hour. >> we're afraid we're not going o the able to keep our guns for our safety. and we're not doing anything wrong. >> reporter: it isn't clear yet whether the nation's second worst school shooting actually drives washington to change any gun laws. but a review by cbs news indicates that schools in at least a dozen states are looking at the nra's call to add armed officers or to allow teachers to carry weapons. >> glor: margaret brennan, thank you. there are eight days now until fhe fiscal cliff of big tax increases for most americans. and across-the-board spending