The Chamber claims it "segregates" the money but won't explain how. Some Democrats actually think it's a bad idea to attack the Chamber for an activity that's loathsome to most voters.
David Dayen at firedoglake has a good take on the controversy:
It’s incredible that anyone would call the charges about the Chamber “baseless.” The Chamber solicits donations from abroad. That money goes into an account. The Chamber then spends $75 million dollars from that same account. They say that the money is segregated but refuse to show any documentation backing that up. Nobody disputes any of this. Why is it at all out of bounds to point it out?
But some battered-wife-syndrome Democrats think that defending themselves during an election is just terribly partisan and not at all what the God-fearing voters in real America want.
Voters in America want jobs in America. The Chamber wants to raise money by helping foreign multinationals move jobs overseas.
Seems pretty cut and dried.