WASHINGTON (Reuters) - The United States stepped back from the brink of default on Tuesday but congressional approval of a last-ditch deficit-cutting plan failed to dispel fears of a credit downgrade and future tax and spending feuds. (http://feeds.feedburner.com/~ff/reuters/topNews?d=yIl2AUoC8zA) (http://feeds.feedburner.com/~ff/reuters/topNews?i=kCAuOohwpdU:9Hyd02vnMzg:V_sGLiPBpWU) (http://feeds.feedburner.com/~ff/reuters/topNews?i=kCAuOohwpdU:9Hyd02vnMzg:-BTjWOF_DHI) (http://feeds.feedburner.com/~r/reuters/topNews/~4/kCAuOohwpdU)