16 January 2013
Updated at 13:50 ET
Mark Mardell
North America editor
President Obama's next campaign - against the gun lobby
President Obama marshaled the rhetorical power of child letter-writers in the statement
US gun debate
Viewpoints: US gun laws
In statistics: Guns in the US
Can gun laws be changed?
Obama: 'Congress must act soon' Watch
President Barack Obama called on Americans, from parents and teachers, to hunters and sportsmen, to say "enough"
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http://www.bbc.co.uk/news/world-us-canada-21047471