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His quest to become the first African-American president will take a new turn when he accepts the Democratic nomination tonight.

Obama first entered the national stage at the last Democratic Convention, four years ago in Boston.

"There is not a liberal America and a conservative America. There is the United States of America," the Illinois senator said during the keynote speech.

His charisma and charm, talked about back then, gave him an edge during the nomination fight.

"I believe there is such a thing as being too late and that hour is almost upon us," said Obama.

Obama raised record amounts of money, much of it over the internet, and drew record crowds. And the youth vote flocked to his campaign.

Obama's big win in Iowa propelled him to the top of the Democratic pack.

And, after losing New Hampshire to Hillary Clinton, he came back swinging – leading to a string of victories in February.

While pundits declared Obama the frontrunner, Clinton kept up the fight, portraying him as inexperienced, not ready to lead. Those are the same attacks Obama is now hearing from his Republican opponent, John McCain.

Obama has been busy firing back.

"John McCain seems to think the Bush years have been pretty good because he's running for a third Bush term," said Obama.

Obama is the son of a black Kenyan father and a white mother from Kansas. He grew up in Hawaii and Indonesia.

Throughout the primary, and now in the general election, Obama has dealt with questions about his religion, patriotism, and values. When he takes center stage tonight, his goal will be to dispel those doubts and convince Americans he's just like them.