Both sides in the argument over fracking claimed victory Wednesday after voters in three Colorado cities approved bans on the oil and gas industry technique. Voters in Boulder, Fort Collins and Lafayette approved either years-long moratoriums or outright bans on fracking. Voters in a fourth town, Broomfield, split on the subject, with a razor-thin margin between those for and against a local ban on hydraulic fracturing. The practice is credited with boosting U.S.