S&P 500 survives first test of significant support By: MarketWatch March 23, 2010 at 11:05 AM EDT The S&P 500 Index has survived its first test of significant support, keeping the U.S. markets on bullish footing. Read More >> Related Stocks: Becton Dickinson China Largecap Ishares ETF EMC Corp Lam Research Marathon Oil SPDR S&P 500 ETF Trust