Stock Market Today: Dow, S&P 500 Flat on Concerns of U.S. Fiscal Picture — Live Updates WSJStock market today: Dow, S&P 500, Nasdaq attempt comeback after Moody's downgrades US credit rating Yahoo FinanceUS debt downgrade drives up borrowing costs BBCBond Selloff Sends 30-Year Treasury Yield Above 5%. What to Do Now. Barron'sMortgage rates cross back over 7% after U.S. credit downgrade CNBC