President Obama is due to speak in Arizona at a memorial service
Former Alaska governor Sarah Palin has attacked as a "blood libel" suggestions that political rhetoric contributed to Saturday's fatal shootings in Arizona.
President Obama is due to arrive in Arizona, where he will speak at a memorial service for the victims of the shootings in Tucson.
Six people died and a Democratic Congresswoman is still in a critical condition.
Mark Mardell reports.
12 Jan 2011