Obama calls for an end to 'sharply polarised' US


Michelle Obama: President Barack Obama and First Lady Michelle Obama at the memorial event, 'Together We Thrive: Tucson and America', at the McKale Memorial Center in Tucson, Arizona, on 12 January 2011.

PHOTOS: Michelle Obama in pictures

Photograph: Jewel Samad/AFP/Getty Images Barack Obama has appealed for an end to the "sharply polarised" debate that has consumed American politics in recent years and provided the backdrop to the aftermath of the bloody Assassination attempt against a congresswoman in Tucson.

VIDEOS: Michelle Obama in videos

Speaking at a memorial event i...