DES MOINES, Iowa Democratic U.S. presidential candidate Hillary Clinton, who has long avoided a firm position on the Keystone XL oil pipeline, broke her silence on Tuesday and said she opposed it.
"I have a responsibility to you and other voters," Clinton, a former secretary of state, said at a town hall event in Iowa about TransCanada Corp's (TRP.TO) project to bring Canadian oil to refineries on the Gulf of Mexico via Nebraska.
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