Via Politico:

A liberal non-profit group linked to Harry Reid is launching what it says will be a long-term multimillion-dollar advertising campaign targeting the conservative Koch brothers.

The campaign, which is funded by Patriot Majority, kicks off Tuesday with a $500,000 cable television ad buy accusing Charles and David Koch of trying “to buy this year’s elections and advance their agenda.” […]

Patriot Majority’s ads, which will air nationally on CNN and MSNBC, are part of a campaign called “Stop The Greed Agenda,” which will be supplemented by a website, direct mail and online ads — all directed at the Kochs, for now.

“We’re going to take them on,” said Craig Varoga, president of Patriot Majority. His group, which spent more than $1 million boosting Reid during his tough 2010 Senate reelection campaign in Nevada, is the non-profit arm of Majority PAC, the super PAC assisted by Reid, the Senate Majority Leader, and other Senate Democrats.