If the lawyer described above had been just as charismatic but named, say, Achola Obama instead of Barack Obama, her goose would have been cooked long ago. Indeed, neither she nor Hillary Clinton could have used Mr. Obama’s public style  or Bill Clinton’s either  without being considered too emotional by Washington pundits.

So why is the sex barrier not taken as seriously as the racial one? The reasons are as pervasive as the air we breathe: because sexism is still confused with nature as racism once was; because anything that affects males is seen as more serious than anything that affects “only” the female half of the human race; because children are still raised mostly by women (to put it mildly) so men especially tend to feel they are regressing to childhood when dealing with a powerful woman; because racism stereotyped black men as more “masculine” for so long that some white men find their presence to be masculinity-affirming (as long as there aren’t too many of them); and because there is still no “right” way to be a woman in public power without being considered a you-know-what.

I’m not advocating a competition for who has it toughest. The caste systems of sex and race are interdependent and can only be uprooted together. That’s why Senators Clinton and Obama have to be careful not to let a healthy debate turn into the kind of hostility that the news media love. Both will need a coalition of outsiders to win a general election. The abolition and suffrage movements progressed when united and were damaged by division; we should remember that.

I’m supporting Senator Clinton because like Senator Obama she has community organizing experience, but she also has more years in the Senate, an unprecedented eight years of on-the-job training in the White House, no masculinity to prove, the potential to tap a huge reservoir of this country’s talent by her example, and now even the courage to break the no-tears rule. I’m not opposing Mr. Obama; if he’s the nominee, I’ll volunteer. Indeed, if you look at votes during their two-year overlap in the Senate, they were the same more than 90 percent of the time. Besides, to clean up the mess left by President Bush, we may need two terms of President Clinton and two of President Obama.

But what worries me is that he is seen as unifying by his race while she is seen as divisive by her sex.