There is no correlation between Brady rankings and homicides caused by firearms. The Brady ranking is a point system introduced by the "Brady Campaign to Prevent Gun Violence" to measure the strength of state gun laws using a variety of criteria: http://www.bradycampaign.org/stategu...scriptions?s=1
Here we see that the strength of gun legislation does not seem to influence the rate of gun murders within the United States, yet we see a strong relationship between poverty levels and homicides: http://www2.macleans.ca/2012/12/20/i...-conversation/
Legislation should not be based on placating an emotional public at an opportune time to win votes, but instead on sound science. According to all the science and sociological data available to us at this time, reducing income disparity and improving conditions for the poorest of Americans would strongly affect the rate of gun violence. Strengthening gun laws, even the "sensible" ones it seems, will not.