This chart shows the distribution of political party affiliation as measured by a self-report survey from the Pew Research Center concerning the recent vote for congress representatives. Those who self-identified as Black were 89% likely to claim that they had voted for a democrat, compared to only 38% of White respondents. Clearly, race is at least a mild predictor of political ideology.

Quite a few of the Blacks I know do not feel free at ALL to say they vote Republican!

If that is the case, then it is quite a shame really. While I do believe that such a fear to express their true political beliefs is a failure of society, it may also be a significant criticism of the Republican party itself. Maybe it's the policies, the image, or the message, but whatever it may be, the Republicans are simply not resonating with minorities.