President Obama has been speaking out a lot about CU and DISCLOSE. When I read the following remarks by the President, I did not realize that “Americans for Prosperity” was a real group:

Right now all around this country there are groups with harmless-sounding names like Americans for Prosperity, who are running millions of dollars of ads against Democratic candidates all across the country. And they don’t have to say who exactly the Americans for Prosperity are. You don’t know if it’s a foreign-controlled corporation. You don’t know if it’s a big oil company, or a big bank. You don’t know if it’s a insurance company that wants to see some of the provisions in health reform repealed because it’s good for their bottom line, even if it’s not good for the American people.
A Supreme Court decision allowed this to happen. And we tried to fix it, just by saying disclose what’s going on, and making sure that foreign companies can’t influence our elections. Seemed pretty straightforward. The other side said no.

But the group is real, it is funded by the Koch brothers (who amassed their fortune in the oil refinery business and then expanded), and it was the subject of a must-read New Yorker piece that I linked to earlier this week.
What was most striking to me about the New Yorker piece was the extent to which the Koch brothers are becoming directly involved in political giving and spending (as opposed to the model of many other super wealthy folks who fund think tanks, foundations and related organizations to more indirectly influence political debate). The Washington Post’s “The Fix” blog offers some important details [corrected link] about the campaign finance spending of Americans for Prosperity.
The New Yorker article ends:

The Kochs have long depended on the public’s not knowing all the details about them. They have been content to operate what David Koch has called ‘the largest company that you’ve never heard of.” But with the growing prominence of the Tea Party, and with increased awareness of the Kochs’ ties to the movement, the brothers may find it harder to deflect scrutiny. Recently, President Obama took aim at the Kochs’ political network. Speaking at a Democratic National Committee fund-raiser, in Austin, he warned supporters that the Supreme Court’s recent ruling in the Citizens United case–which struck down laws prohibiting direct corporate spending on campaigns–had made it even easier for big companies to hide behind “groups with harmless-sounding names like Americans for Prosperity.” Obama said, “They don’t have to say who, exactly, Americans for Prosperity are. You don’t know if it’s a foreign-controlled corporation”–or even, he added, “a big oil company.”