Dow Jones futures fell slightly overnight, while S&P 500 futures rose and Nasdaq futures jumped. Nvidia (NVDA) skyrocketed late on booming artificial intelligence demand for its high-powered chips, lifting a variety of chip and AI plays. The U.S. government's credit rating is under threat due to the debt-ceiling standoff, Fitch warned. X ELF Beauty (ELF), Snowflake (SNOW) UiPath (PATH) and Splunk (SPLK) also were big earnings movers. The stock market rally retreated for a second straight session, amid ongoing debt-ceiling talks. The Nasdaq is still above key levels, but the S&P 500 is back in its sideways range after retreating...