It's about what one could expect. The dimocratic party isn't a collection of people with common interests. It's a run-on list of special interests who are in a coalition.
Sometimes, the interests of party partners differs. In this case, Teachers Unions and Blacks. Well, if they support vouchers, they lose the Union money/vote and make blacks happy. If they oppose vouchers, they keep the Union money/vote and still don't lose the black vote. At least that's their gamble.
In most any situation in the dimocratic party where blacks interests are in opposition to other party members, then look for the blacks to lose out. They're taken for granted, and I hope we can make greater inroads to the black community on lots of issues, although I think vouchers are the best way to start.