WASHINGTON DC -- Two supporters of the Keystone XL pipeline in Nebraska are in Washington today to testify before a House subcommittee. Dennis Houston, president and CEO of the Norfolk Area Chamber of Commerce, appears before the House Commerce Subcommittee. Ron Kaminski, business manager for the Laborers Local 1140 in Omaha, will also speak in support of the project. Opponents are continuing to urge President Obama to deny a federal permit for the proposed Canada-to-Texas oil pipeline, saying it doesn't serve U.S. energy interests and would contribute to global warming. Supporters say the pipeline is by far the safest way to transport the oil from Canadian tar-sands deposits.