Bells Toll For Two-Year Anniversary Of Tucson Supermarket Shooting

Bells are expected to ring across Tucson two years to the minute after a mentally ill gunman opened fire at a supermarket where former Representative Gabrielle Giffords was meeting with constituents. 

This morning's (Tuesday 8) commemoration comes against the backdrop of a national gun control debate that has flared since last month's mass school shooting in Connecticut.

Giffords and her husband have called for greater gun control efforts, and they are doing an interview on ABC in which will they will talk about the legacy of the shooting.