Democrats have as much to worry about as Republicans do on this. Most Blacks are opposed to the Bush/Kennedy/McCain/Hillary/ amnesty for illegal aliens as are just about all legal immigrants including Hispanics.
If Democrats lose an additional 10% of the Black vote in any national election, and in most state wide elections, they are in trouble. The House isn’t as much of a problem because the districts are gerrymandered to be safe.
I know the people who run this group. http://www.alamo-coalition.org They are growing every day and about to make some noise. There are other Black groups getting involved too, which will be a big help in the fight.
Democrats are feeling the heat too. This, IMO, is why Dean is starting to talk about enforcement first.
The key to winning this fight is to keep the pressure up. The pro-criminal forces have the leadership of both parties, but we have the people and the votes.
Some very good points you make.