Hill: The Obama administration is fighting in federal court to defend its hydraulic fracturing (fracking) rule, saying a lower court committed a legal error when it put the regulation on hold. Lawyers representing the Interior Departments Bureau of Land Management (BLM) are asking the Court of Appeals for the 10th Circuit in Denver to overturn a Wyoming-based courts decision last year to halt the rule and allow regulators to enforce it. That judicial injunction stemmed from the arguments from various...