NYT:

David Koch retreated in November to his Park Avenue co-op after spending a relative pittance. But New York City saw a spasm of unregulated campaign money, most of it unleashed by wealthy Democrats and unions. And no one channeled those rivulets of cash more aggressively than Scott Levenson and the Advance Group, the strategic consulting firm he heads.

The United Federation of Teachers dropped millions of dollars and Mr. Levenson took at least a $370,000 cut. A group putatively devoted to carriage horses but focused intently on defeating the speaker of the City Council, Christine C. Quinn, spent a golden lode, and again Mr. Levenson took a cut.