Miami Herald: Senate supporters of a bill that for the first time would put limits on U.S. greenhouse gas emissions have launched an intense one-on-one effort to sound out their colleagues’ views in hopes of winning their support. It’s by no means clear that they will succeed, however. A climate and energy bill squeaked through the House of Representatives in June. But in the Senate, the odds are against it because Senate rules generally require a 60-vote majority to move legislation to a …