I disagree. Though newspapers should exercise some discretion when prosecutors/government officials ask them to hold off on publishing a story, they are (with some narrow, national-security-based exceptions) within their First Amendment rights to ignore such requests. Frankly, with an Obama administration coming in (and with all of the 'unofficial' DNC control over the media that comes with that), I don't want the government to have any more control over what the media does/does not publish than is absolutely necessary for national security.
I don’t know how they can be accused of obstruction if the prosecution agreed to it.
Precisely! If this is true, the Trib editor and the reporter deserve to be charged Obstruction of Justice in a Federal Investigation -- where is the question mark?