A conservative group backed by the billionaire Koch brothers and their wealthy allies boasts a scorecard on its website that rates the presidential candidates based on their opposition to policies meant to tackle climate change, such as EPA regulation of greenhouse gas emissions, a renewable fuels standard, and a tax credit that benefits wind energy.Texas senator Ted Cruz scored the highest rating on the American Energy Alliance site, which labelled him a "hero" due in part to his opposition to regulation and taxes. Cruz was followed on the scorecard by four other Republican candidates - Florida senator Marco Rubio, ex-Florida...