I do not think it means what you think it means

"Senate Majority Leader Harry M. Reid’s relentless attacks on the billionaire Koch brothers are having an unforeseen impact: spurring other wealthy Republican donors to give more money to groups that keep their supporters’ names secret."

Unforseen? Gosh, if Harry gets wind of this, he'll start complaining about dark money!

Why, the Washington Post might even do that!

(Obviously, this applies only to Republicans. The Post won't worry too much about DDM.)