The conventional wisdom just hours after the country learned about the horrifying outburst of gun violence in Aurora, Colorado was that although it was indeed tragic, nothing could be done legislatively to insure that such an incident could be stopped in the future.

One voice in American political culture dared to differ – New York Mayor Michael Bloomberg, who like other U.S. mayor and police chiefs, have never kept quiet about the need for sensible gun regulations.

On CBS' Face The Nation, Bloomberg reiterated the point that he believes in this time of national tragedy, it's high time that the presidential candidates talk substantively about this issue.