Party
The Democrats - they're a bit like America's version of the Labour Party
Age
47
Family
Married to Michelle, with two daughters
Fave song
Ready Or Not by The Fugees
Background
He is the first black candidate to become the presidential candidate of either major American party.
His mum's American, his dad is African and he was born on one of the American islands of Hawaii.
He also lived in Indonesia, in south east Asia, for a while as a child.
After studying law at one of the country's top universities, he worked as a lawyer for people's rights before getting into politics.
Climate change
He wants America to lead the way in the global effort to tackle climate change, including slashing America's greenhouse gas emissions by a whopping 80% by the year 2050.
He also says he will invest a staggering $150billion (about £100 billion) over 10 years in clean energy.
War in Iraq
Obama was against the war in Iraq and if he wins he says he'll pull out all the American troops within 16 months.
Other stuff
If he does, he'll become America's first black President.
As little as 50 years ago, African Americans didn't have the same rights as everyone else and in some places, black and white children weren't even allowed to go to the same schools.
Although racism is still a problem in some parts of America, lots of people think that if Obama can win the election it would show the rest of the world how much America has changed.
The Democrats - they're a bit like America's version of the Labour Party
Age
47
Family
Married to Michelle, with two daughters
Fave song
Ready Or Not by The Fugees
Background
He is the first black candidate to become the presidential candidate of either major American party.
His mum's American, his dad is African and he was born on one of the American islands of Hawaii.
He also lived in Indonesia, in south east Asia, for a while as a child.
After studying law at one of the country's top universities, he worked as a lawyer for people's rights before getting into politics.
Climate change
He wants America to lead the way in the global effort to tackle climate change, including slashing America's greenhouse gas emissions by a whopping 80% by the year 2050.
He also says he will invest a staggering $150billion (about £100 billion) over 10 years in clean energy.
War in Iraq
Obama was against the war in Iraq and if he wins he says he'll pull out all the American troops within 16 months.
Other stuff
If he does, he'll become America's first black President.
As little as 50 years ago, African Americans didn't have the same rights as everyone else and in some places, black and white children weren't even allowed to go to the same schools.
Although racism is still a problem in some parts of America, lots of people think that if Obama can win the election it would show the rest of the world how much America has changed.
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