Politico: It’s going to be hard winning the Republican presidential nomination if you’re not a climate skeptic. Recent comments from top White House and congressional contenders suggest an awkward mix of outright hostility or, at best, ambivalence toward the widespread scientific consensus that humans are responsible for the warming planet. Fueled by tea party rage, anti-government sentiment and hostility to anything attached to President Barack Obama, the 2012 GOP primary field is …