WASHINGTON (Reuters) - President Barack Obama has signed a deficit-reduction measure into law to cut spending and raise the U.S. debt ceiling and avert an unprecedented default, the White House said on Tuesday. (http://feeds.feedburner.com/~ff/reuters/topNews?d=yIl2AUoC8zA) (http://feeds.feedburner.com/~ff/reuters/topNews?i=klwauAS5a7s:CGf_pp-PONA:V_sGLiPBpWU) (http://feeds.feedburner.com/~ff/reuters/topNews?i=klwauAS5a7s:CGf_pp-PONA:-BTjWOF_DHI) (http://feeds.feedburner.com/~r/reuters/topNews/~4/klwauAS5a7s)