Republican oil mogul Harold Hamm says Congress is wasting its time debating the Keystone XL pipeline. “It’s not relevant at all, in my opinion. And here we are making it relevant now? Forget it,” the billionaire CEO of Oklahoma-based Continental Resources told Politoco in an interview Friday, just before the House passed a bill aimed at approving the pipeline. […] Hamm said his company, which had planned to use Keystone to ship some of its North Dakota crude, is already using other pipelines for half of its oil. And the percentage is growing. “We’re supporting other pipelines out there; we’re...