The great debate again

From George Will:

I think this adds to my calculation -- this is very hard to measure -- but it seems to me if we had the tools to measure we'd find that Barack Obama gets two votes because he's black for every one he loses because he's black because so much of this country is so eager, a, to feel good about itself by doing this, but more than that to put paid to the whole Al Sharpton/Jesse Jackson game of political rhetoric

I really have no idea about this. And neither does George WIll. He can't know. What is the problem with people simply saying, "You know what, I don't know the answer to that." It's why I never want to be a pundit. The entry requirement seems to be that you have to act like you have an answer to everything, when sometimes, you just don't have a fucking clue. Is "I don't know" outlawed or something?