This belief comes from my unyielding faith in the decency and generosity of the American people. But it also comes from my own American story.

I am the son of a black man from Kenya and a white woman from Kansas. I was raised with the help of a white grandfather who survived a Depression to serve in Patton's Army during World War II and a white grandmother who worked on a bomber assembly line at Fort Leavenworth while he was overseas. I've gone to some of the best schools in America and lived in one of the world's poorest nations. I am married to a black American who carries within her the blood of slaves and slaveowners - an inheritance we pass on to our two precious daughters. I have brothers, sisters, nieces, nephews, uncles and cousins, of every race and every hue, scattered across three continents, and for as long as I live, I will never forget that in no other country on Earth is my story even possible.

It's a story that hasn't made me the most conventional candidate. But it is a story that has seared into my genetic makeup the idea that this nation is more than the sum of its parts - that out of many, we are truly one.

Throughout the first year of this campaign, against all predictions to the contrary, we saw how hungry the American people were for this message of unity. Despite the temptation to view my candidacy through a purely racial lens, we won commanding victories in states with some of the whitest populations in the country. In South Carolina, where the Confederate Flag still flies, we built a powerful coalition of African Americans and white Americans.

This is not to say that race has not been an issue in the campaign. At various stages in the campaign, some commentators have deemed me either "too black" or "not black enough." We saw racial tensions bubble to the surface during the week before the South Carolina primary. The press has scoured every exit poll for the latest evidence of racial polarization, not just in terms of white and black, but black and brown as well.

And yet, it has only been in the last couple of weeks that the discussion of race in this campaign has taken a particularly divisive turn.

On one end of the spectrum, we've heard the implication that my candidacy is somehow an exercise in affirmative action; that it's based solely on the desire of wide-eyed liberals to purchase racial reconciliation on the cheap. On the other end, we've heard my former pastor, Reverend Jeremiah Wright, use incendiary language to express views that have the potential not only to widen the racial divide, but views that denigrate both the greatness and the goodness of our nation; that rightly offend white and black alike.