I have come home from a long stay in Mexico to find - because of the presidential campaign, and especially because of the Obama-Clinton race for the Democratic nomination - a new country existing alongside the old. On any given day we, collectively, become the goddess of the three directions and can look back into the past, look at ourselves just where we are, and take a glance, as well, into the future. It is a space with which I am familiar.

When I joined the freedom movement in Mississippi in my early 20s, it was to come to the aid of sharecroppers, like my parents, who had been thrown off the land they'd always known - the plantations - because they attempted to exercise their "democratic" right to vote. I wish I could say white women treated me and other black people a lot better than the men did, but I cannot. It seemed to me then, and it seems to me now, that white women have copied all too often the behaviour of their fathers and their brothers. In the south, especially in Mississippi, and before that, when I worked to register voters in Georgia, the broken bottles thrown at my head were gender-free.

I made my first white women friends in college; they loved me and were loyal to our friendship, but I understood, as they did, that they were white women and that whiteness mattered.

I am a supporter of Barack Obama because I believe he is the right person to lead the United States at this time. He offers a rare opportunity for the country and the world to do better. It is a deep sadness to me that many of my feminist white women friends cannot see him, cannot hear the fresh choices toward movement he offers. That they can believe that millions of Americans choose Obama over Clinton only because he is a man, and black, feels tragic to me.

When I have supported white people, it was because I thought them the best to do the job. If Obama were in any sense mediocre, he would be forgotten by now. He is, in fact, a remarkable human being, not perfect but humanly stunning, like King was and like Mandela is. He is the change America has been trying desperately and for centuries to hide, ignore, kill. The change it must have if we are to convince the rest of the world that we care about people other than our (white) selves.

True to my inner goddess of the three directions, however, this does not mean I agree with everything Obama stands for. We differ on important points, probably because I am older; I am a woman and person of three colours (African, Native American, European); I was raised in the south; and, when I look at the world after 64 years of life, there is not one person I wish to see suffer.

I want a grown-up attitude to Cuba, for instance, a country and people I love. I want an end to the war immediately, and I want the soldiers to be encouraged to destroy their weapons and drive themselves out of Iraq. I want the Israeli government to be made accountable for its behaviour to the Palestinians, and I want the people of the US to cease acting as if they don't understand what is going on. But most of all I want someone with the confidence to talk to anyone, "enemy" or "friend", and this Obama has shown he can do.

It is hard to relate what it feels like to see Mrs Clinton (I wish she felt self-assured enough to use her own name) referred to as "a woman" while Barack Obama is always referred to as "a black man". One would think she is just any woman, but she is not. She carries all the history of white womanhood in the US in her person; it would be a miracle if we, and the world, did not react to this fact. How dishonest it is, to try to make her innocent of her racial inheritance.

I can easily imagine Obama sitting down and talking to any leader - or any person - in the world, with no baggage of past servitude or race supremacy to mar their talks. I cannot see the same scenario with Clinton, who would drag into 21st-century US leadership the same image of white privilege and distance from others' lives that has so marred the country's contacts with the rest of the world. But because Clinton is a woman and may be very good at what she does, many people (some in my own family) originally favoured her. I understand this, almost. It is because there is little memory, apparently, of the foundational inequities that still plague people of colour and poor whites.

When I offered the word "womanism" many years ago, it was to give us a tool to use, as feminist women of colour, in times like these. These are the moments we can see clearly, and must honour devotedly, our singular path as women of colour in the US. We are not white women, and this truth has been ground into us for centuries. But neither are we inclined to follow a black person, man or woman, unless they demonstrate considerable courage, intelligence, compassion and substance.

We have come a long way, sisters, and we are up to the challenges of our time, one of which is to build alliances based not on race, ethnicity, colour, nationality, sexual preference or gender, but on truth. Even if Obama becomes president, our country is in such ruin it may be beyond his power to lead us to rehabilitation. If he is elected, however, we must, as citizens of the planet, insist on helping him do the best job that can be done; more, we must insist that he demand this of us. And remember, as poet June Jordan and Sweet Honey in the Rock never tired of telling us: We are the ones we have been waiting for.

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A longer version of this article can be found at theroot.com/id/45469