The main U.S. markets were poised to post their first weekly advances in three, heading into the close on a stronger note but off the day's highs as jitters over the probe into Russian meddling in U.S. politics briefly dented the positive sentiment that drove much of the session.
Health care, real estate and utilities had some of the best increases among the 11 S&P 500 sectors, while on the Dow Jones Industrial Average, Pfizer ( PFE ) and UnitedHealth ( UNH ) led the gainers. Losses in Kraft Heinz (KFC) after the food company's earnings kept the Nasdaq Composite under water.
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