Fitch Signals Possible Downgrade of U.S. Credit Rating

NBC reports:

One of the country's major credit rating agencies signaled Tuesday that it could downgrade the U.S. rating, citing the impasse in Washington over raising the debt ceiling. 

Fitch Ratings put the U.S. government's AAA credit rating on "rating watch negative," which means there's a higher probability of a rating change, and that it could be negative. 

"Although Fitch continues to believe that the debt ceiling will be raised soon, the political brinkmanship and reduced financing flexibility could increase the risk of a U.S. default," the rating agency wrote in a statement. 

I wonder if my credit rating could be improved by getting a higher limit credit card. It would certainly give me more financial flexibility.