Roughly a third of all money for or against came from three people: Bill Gates, Steve Ballmer and Paul Allen.
The report is based on more than a decade of empirical evidence and interviews with 70 witnesses across the country conducted over the course of a year.
Gun control advocates and gun rights advocates are fighting over ballot measures that would change state law.
Two states experienced mass shootings. Their responses couldn't have been more different.
A detailed look at the much-disputed list.
The nation has seen an average of one school shooting a week for the last year and a half.
Members on both sides have weighed in.
The bill would allow firearms to be withheld while a person's competency is determined.
Gov. Bobby Jindal is considering legislation to allow concealed weapons in bars.
If approved by voters, it would protect each resident's right to own firearms, ammunition and accessories — rights it defines as "unalienable."