Democratic U.S. presidential candidate Hillary Clinton said on Tuesday that she opposes the Keystone XL pipeline. “I have a responsibility to you and other voters,” Clinton, a former secretary of state, said at a town hall event in Iowa. “I think it is imperative that we look at the Keystone pipeline as what I believe is the distraction from the important work we have to do to combat climate change.” “Therefore, I oppose it,” she said.