Rosenblum points out that Bill Clinton in 1994 announced that the Agreed Framework was a "good deal" for the United States. In the end, North Korea kicked out inspectors and developed nuclear weapons. This anecdote is supposed to prove that history will repeat itself, and the deal with Iran will also result in Iran obtaining nuclear weapons.
Rosenblum here paints a very misleading picture. In reality, North Korea was already giving the IAEA significant problems before 1994. The Agreed Framework was an effort by the United States to get things back on track. However, things continued to proceed in the same fashion and North Korea continued its nuclear weapons development. The Agreed Framework had basically no impact one way or another.
In other words, while it is true that the framework failed - it did nothing to help North Korea obtain nuclear weapons. It was simply an agreement that North Korea violated and was therefore discontinued by the United States. The same could of course happen with this deal with Iran - but that does not mean that the deal should be terminated at this juncture. You can read the full history of North Korea and WMD's here.
The article by Rosenblum is typical of other Jblog pundits in its oversimplification of foreign policy in general. Many pundits in the Jblogosphere view Obama and the Democrats as isolationists (or even worse in Rosenblum's case). I thought it might be worthwhile to post this video by John Mearsheimer in which he goes through four "grand strategies" of foreign policy in general. Isolationism is one of them - but that is not where Mearsheimer places Obama. While I do not necessarily agree with everything Mearsheimer says, I think that this lecture demonstrates that there is much more to understand regarding these issues than what we get in mass media.