Commodity weakness set to weigh on Wall Street By: CNBC.com News December 08, 2015 at 06:00 AM EST U.S. stock index futures pointed to lower open on Tuesday after a sharp decline in oil and iron ore prices weighed on sentiment. Read More >> Related Stocks: AutoZone PowerShares QQQ S&P 500 Ishares Core ETF SPDR S&P 500 ETF Trust Sentinelone Inc Cl A