Up to 80,000 Democrats are expected to pack into an American football stadium for the biggest night of Barack Obama's career.
Obama will be calling on America to join his crusade for change today when he speaks at the Democrat National Convention in Denver, claiming his prize as the first-ever black presidential nominee of a major US political party.
His nomination comes 45 years to the day since Martin Luther King's "I have a dream" speech, where King spelled out an electrifying vision for racial equality.
Political analyst Gloria Borger says Obama must explain what "change" means for people.
“I think what he has to do, is have a conversation with the American people – not only about who he is and his values, but about what he can do for them to change their lives.”
The night will also be one of glitz and glamour, with a number of Obama’s celebrity barrackers making an appearance.
Motown icon Stevie Wonder, and ‘Dreamgirl’ Jennifer Hudson, will belt out the national anthem.
Will.i.am from the Black Eyed Peas, who publicly showed his support for Obama with his song "Yes we can", based on Obama’s speech, will also rock the crowd.
His Republican foe John McCain, meanwhile, is finalising his choice of vice presidential nominee, expected to be known later today.
