In what has become a perennial exercise before every debt-ceiling showdown since at least Obama’s first term (when S&P did the unthinkable and cut the US’s coveted AAA credit rating, exposing itself to extensive abuse by Tim Geithner), ratings agencies are starting to beat the credit-rating downgrade drum, with Fitch getting a jump on the competition Wednesday when its head of sovereign ratings warned that an enduring shutdown battle could negatively impact the negotiations over the debt ceiling, which could prompt Fitch to join S&P in eliminating its AAA rating for the US. Read More.