WASHINGTON (Reuters) - The economy stumbled badly in the first half of 2011 and came dangerously close to contracting in the January-March period, raising the risk of a recession if a standoff over the nation's debt does not end quickly. (http://feeds.feedburner.com/~ff/reuters/topNews?d=yIl2AUoC8zA) (http://feeds.feedburner.com/~ff/reuters/topNews?i=HS6Z1A51HHM:po-1uQSpfP4:V_sGLiPBpWU) (http://feeds.feedburner.com/~ff/reuters/topNews?i=HS6Z1A51HHM:po-1uQSpfP4:-BTjWOF_DHI) (http://feeds.feedburner.com/~r/reuters/topNews/~4/HS6Z1A51HHM)