Obama's achievement extraordinary: Rudd (AAP)

Prime Minister Kevin Rudd has praised the achievement of Barack Obama who will accept the Democratic US presidential nomination at a mass rally in Denver, Colorado. Mr Rudd said he had spoken with Senator Obama on the phone and described the presidential hopeful, who is seeking to be the first black American in the White House, as "a very warm person". "I had a conversation with Senator Obama last week and we... [read full story]