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Judy Woodruff interviews Commissioner John Koskinen about these problems.
Special correspondent Jane Arraf, reporting from Baghdad, joins Gwen Ifill.
We look at Spieth’s career and accomplishment with John Feinstein of The Washington Post.
Cement's production comes with a huge carbon footprint.
Gwen Ifill talks to Amy Walter of the Cook Political Report and Tamara Keith of NPR.
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