re: What percentage of blacks think OJ did it, and what percentage of whites think he didn’t?

To convict him, you would've had to completely ignore the cop that perjured himself on the stand.
He also invoked the 5th when asked if he had planted evidence.

Most everybody "thinks" he did it, but a lot people, in hindsight, think the jury had room for reasonable doubt.

This case isn't nearly as simple (in terms of black vs white) as people make it out to be.