S&P bank downgrades, Nvidia earnings hype: Top Stories

S&P Global downgrades the credit ratings on U.S. regional banks KeyCorp (KEY), UMB Financial (UMBF), Comerica (CMA), Valley National Bancorp (VLY), Associated Banc-Corp (ASB), all closing lower on Tuesday. Nvidia (NVDA) shares dip as investors anticipate the chipmaker's second-quarter earnings results after the closing bell on Wednesday, August 23. Yahoo Finance hosts Diane King Hall and Seana Smith take a look at several of the top stock stories after Tuesday's closing bell.