6 PM ET: Poll finds Democrats pessimistic, a drinking water discovery, new McValue menu & more

We’ll tell you who President-elect Donald Trump is expected to choose for the role of secretary of Agriculture. A new Pew Research Center poll finds that the vibe among Democrats is measurably bad. Scientists have had a breakthrough on a drinking-water mystery. A new McValue menu is coming next year. Plus, a 17-year-old Afghan girl won the International Children’s Peace Prize.

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