Ryan Sitton, an oil and gas engineer running for Texas railroad commissioner, introduces himself in his first television ad, saying he will help Texas lead the U.S. to energy independence. He faces Becky Berger, Malachi Boyuls and Wayne Christian in the Republican primary. 

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Jim Malewitz was a reporter at the Tribune from 2013 to 2017, covering energy and environment and then working on investigations. Previously, he covered those issues for Stateline, a nonprofit news service...