Politico: Conservatives on and off Capitol Hill are waging a campaign to show that the Michigan Republican isn’t conservative enough to chair the powerful committee that will be in the center over fight on health care and energy policy next year. For proof, they’re pointing to Upton’s support for phasing out some incandescent light bulbs in favor of greener alternatives. Right-wing talk show host Rush Limbaugh cited Upton’s promotion of eco-friendly light bulbs evidence that he shouldn’t take the Energy…