According to the FBI's report on crime in 2009, violent crime has decreased. John R. Lott Jr. believes President Obama is inadvertently responsible for the decrease.
As Lott notes in National Review Online, gun sales began to rise after Obama won the presidential election in 2008. Lott states that at the same time gun sales were soaring, murder rates were dropping.
You can read Lott's piece via the below link:
The above American Rifleman photo is of a Smith & Weston .38, Model 10.