"Campaign Money Watch, the group that bills itself as a nonpartisan advocate for campaign finance reform, is attacking Senate Republican Leader Mitch McConnell.
The Washington-based group is spending almost $400,000 on the attack, which includes a tough new television ad and website.
In filing with the Federal Election Commission, Campaign Money Watch disclosed a new batch of donors paying for the attack on the Kentucky senator. Its biggest contributor was the liberal online advocacy group, MoveOn.org, which gave $400,000.
Campaign Money Watch received $130,000 from billionaire Jerome Kohlberg, a founder of the private equity firm Kohlberg Kravis Roberts & Co., and $30,000 from Communication Workers of America.
Campaign Money Watch's parent group describes itself as a "nonprofit, nonpartisan organization dedicated to improving America’s campaign finance laws."
Previously, Campaign Money Watch attacked John McCain, who co-wrote the current campaign McCain-Feingold finance law."