US stock market today: Why Dow is down while S&P 500 and Nasdaq surge – UnitedHealth earnings and Medicare policy rattle healthcare stocks

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Dow slips as UnitedHealth rout offsets tech rally. S&P 500, Nasdaq hold near records. The Dow Jones Industrial Average dropped 334.77 points to 49,077.63 on Tuesday, weighed down by a 15% plunge in …