WaPo gives no shout out to the Nation

"Here's a question for journalists to consider: when does imitation become expropriation? That is, when should one media outlet grant credit to another for first reporting news?" begins a letter from the Nation's David Corn (scroll down) to Poynter's letters forum. "I ask this today because I am somewhat bemused by a front-page article that appeared in The Washington Post this morning...[which] begins with the story of a memo Felt (now a.k.a. Deep Throat) wrote on February 21, 1973, in which he decried leaks to Woodward and Bernstein and ordered an investigation into the latest leak. Later in the article, Dobbs cites a September 11, 1972, memo in which Felt reacted similarly. I am familiar with these documents because a week ago, The Nation published a cover story by Jeff Goldberg and me... that first disclosed the existence of these memos...[yet] Nowhere in the Dobbs article is there any acknowledgment that The Nation had unearthed and reported these documents a week before the Post published its piece." Update: The Post writer has responded and Corn has too. Scroll down to original and read upward for correspondence. (Poynter)