Most experts say a mass killing of elementary schoolers could - and certainly should - lead to the first real political debate about violence and gun control since Congress passed the Brady Bill for handgun background checks. Adam Winkler, author of 2011's "Gunfight: The Battle over the Right to Bear Arms in Ameria," says he believes it's possible that this will be a turning point.

At least 120,000 people signed a petition on the White House website urging President Obama to push Congress for tighter gun laws, an all-time record.


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Poll: Do you think federal laws should be changed regarding gun control?
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