The markets are shrugging off the Fitch downgrade of the U.S. long term credit. Business titans like JPMorgan Chase CEO Jamie Dimon told CNBC that America’s credit is sound, and Warren Buffett told CNBC that he isn’t worried either; he’s not slowing down his purchases of Treasury bills. Senator Joe Manchin (D-West Virginia) responds to the downgrade and to those comments from Buffett and Dimon, and suggests that there’s something lawmakers could learn from the decision, about responsible fiscal spending.  In this episode:Sen. Joe Manchin, @Sen_JoeManchinAndrew Ross Sorkin, @andrewrsorkinBecky Quick, @BeckyQuickJon Fortt, @jonforttCameron Costa, @CameronCostaNY