CBS News found that although poll after poll has shown that a majority of Americans favor tougher gun laws little has happened. One reason for that, researchers believe, is because for the shrinking number of Americans who do own guns, this is not just a big issue, it's the only issue.

In fact, a recent study found the number of gun owners in America has never been more concentrated than it is now among a small number of white, middle-class rural men.

"We find that about 10 percent of the adults in the United States own about 80 percent of all the guns,” said professor Jens Ludwig of Georgetown University, who conducted the study. That translates into about 150 million guns.