President Obama has been telling America for months that special tax breaks for the oil and gas industry must come to an end. The presidential demand always prompts puzzled gazes among tax and energy-industry experts, who ask: What special tax breaks?

Thanks in part to a bill sponsored by Rep. Chris Van Hollen, a Democrat from Maryland and ranking member on the House Budget Committee, it's all much clearer now. The congressman has inadvertently called attention to the fact that those special tax breaks just for the oil and...