Obama launches historic campaign :

Barack Obama has accepted the Democratic Party's historic nomination to run for president of the US in front of a crowd of some 75,000 people.
In an address at the party's national convention in Denver, he promised he would do his best to keep alive the American dream of opportunity for all.
"America, we are better than these last eight years," he told cheering crowds. "We are a better country than this."
Mr Obama is the first African-American to be nominated by a major US party.
In his speech, Mr Obama promised to reverse the economic downturn afflicting the US and restore the nation's standing in the world.
He also attacked the record of the Bush administration and his Republican rival for the presidency, John McCain.