
Senator Joe Biden, accepting the nomination to run for vice-president, also praised Mr Obama's leadership.
Earlier, Mr Obama was formally named as Democratic candidate for the White House, the first African-American to be nominated by a major US party.
He made a surprise late appearance at the convention to rally the crowds.
Coming on stage at the end of Mr Biden's address, Mr Obama joked that the party's convention was "going pretty well" and praised his wife, Michelle, and Hillary Clinton for their speeches.
Mr Obama was not expected to speak until Thursday, when he will formally accept the party's nomination to stand against Republican John McCain in the 4 November election.
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