Ken Winston is a Nebraska-based attorney who represents the Sierra Club on matters related to Keystone XL. From Nebraska to Federal Court, the Sierra Club Keeps Up the Fight on Keystone XL Press Releases Sierra Club Endorses John Cavanaugh for CongressMar 2 2026 Omaha, NE – Today, the Sierra Club announced its endorsement of State Senator John Cavanaugh in the 2026 election for the office of House of Representatives in Nebraska’s Second Congressional…