In "Hard Choices", HRC ENDORSED the TPP. So we actually do know her position
She's just playing political games with her "reserving judgment" line. Her book was written after she left the State Department. She should have the guts to come out with her position, instead of pretending that she's reserving judgment.
I'm interested in hearing how she really is reserving judgment and she's evolving or whatever the defense/excuse is.
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She argued for TPP as secretary of state and in her 2014 memoir, "Hard Choices" but has been noncommittal since. She has said on this issue only that "any trade deal has to produce jobs and raise wages and increase prosperity and protect our security, and we have to do our part in making sure we have the capabilities and the skills to be competitive."
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http://www.cbsnews.com/news/10-questions-for-hillary-clinton/
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Yet, previously as secretary of state, Clinton called the Trans-Pacific Partnership the "gold standard in trade agreements." In her second memoir, Hard Choices, released in 2014, Clinton lauded the deal, saying it "would link markets throughout Asia and the americas, lowering trade barriers while raising standards on labor, the environment, and intellectual property." She even said it was "important for American workers, who would benefit from competing on a more level playing field." She also called it "a strategic initiative that would strengthen the position of the United States in Asia."
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http://www.npr.org/sections/itsallpolitics/2015/04/21/401123124/a-timeline-of-hillary-clintons-evolution-on-trade