In a BBC interview last July, US President Barack Obama admitted that failure to pass "common sense gun safety laws" in the US has been the greatest frustration of his presidency. Since he took office in 2008, there have been repeated mass shootings including the 2011 Tucson Arizona shooting in which Gabrielle Giffords, then a member of Congress and 18 others were shot in a supermarket parking lot. Six people died that day. Another shooting was at Emanuel African... (GunPolicy.org)