Actually, IIRC 2004 saw both Jews and Blacks vote in higher percentages for Republicans than they have in many years.
I don't know how things were in previous elections but African Americans voted only 11% for Bush. It is only slightly better with 25% for Jewish voters.
In reality what this means is that we all have some work to do but we should be able to yield tremendous results.
If the GOP got 25% of the black vote and 40% of the Jewish vote the democratic party was cease being a national party.