The billionaire brothers’ influence is most visible in the makeup of the House Energy and Commerce Committee, where members have vowed to undo restrictions on greenhouse gases.

The billionaire brothers David and Charles Koch no longer sit outside Washington’s political establishment, isolated by their uncompromising conservatism. Instead, they are now at the center of Republican power, a change most evident in the new makeup of the House Energy and Commerce Committee.

Wichita-based Koch Industries and its employees formed the largest single oil and gas donor to members of the panel, ahead of giants like Exxon Mobil, contributing $279,500 to 22 of the committee’s 31 Republicans, and $32,000 to five Democrats.

Nine of the 12 new Republicans on the panel signed a pledge distributed by a Koch-founded advocacy group — Americans for Prosperity — to oppose the Obama administration’s proposal to regulate greenhouse gases. Of the six GOP freshman lawmakers on the panel, five benefited from the group’s separate advertising and grass-roots activity during the 2010 campaign.

Claiming an electoral mandate, Republicans on the committee have launched an agenda of the sort long backed by the Koch brothers. A top early goal: restricting the reach of the Environmental Protection Agency, which oversees the Kochs’ core energy businesses.

The new committee members include a congressman who has hired a former Koch Industries lawyer as his chief of staff. Another, Rep. Morgan Griffith of Virginia, won a long-shot bid to unseat a 14-term moderate Democrat with help from Americans for Prosperity, which marshaled conservative activists in his district. By some estimates, the advocacy group spent more than a quarter-million dollars on negative ads in the campaign. “I’m just thankful that you all helped in so many ways,” Griffith told an Americans for Prosperity rally not long after his election.

Perhaps the Kochs’ most surprising and important ally on the committee is its new chairman, Rep. Fred Upton. […]

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