As of July 2003, Florida was second among states in black population, at 2.8m. Ohio is 12th at 1.4m and Pennsylvania is 14th at 1.2m. I think Bush garnering 18% of the black vote is a substantial overall pickup. Especially in the three states I highlighted.
In 2000 there were roughly 106 million votes cast for POTUS. About 10% of that 106m were from black voters. Bush recieved 9%, or 954K. If he doubles his take this time around, Bush will get 1.908m. That's all based on 2000 voting stats. Get out the vote efforts will increase the total votes Bush receives in 2004. Bush could garner 2.5m. Substantial.
If not, let's drop the discussion. I think we've both agreed that the news about increased black support is quite welcome.