What is the Public Disapproving Of?

http://www.huffingtonpost.com/brendan-nyhan/no-evidence-obama-deficit_b_851120.html
In this short post, Brendan Nyhan of Huffpost politics calls out NBC for inaccurately interpreting Presidential popularity polling. In their "First Read" newsletter they postulate that Obama's deficit speech didn't "play well" based on the fact that his popularity had gone down 4 points since a poll a month earlier. As Nyhan points out, however, any events which occurred during the month may have hurt the President's popularity, and trying to prove causality on the speech would be tough. Even more disturbingly, he claims that the Gallup poll which is also cited actually contradicts NBC's analysis when looked at closely.
Huffpost is a liberal blog, so anything reads there needs to be taken with a grain of salt, but this blog isn't really serving a partisan purpose. Nyhan doesn't argue that the President's popularity is down, he just points out that the reason isn't as obvious as NBC makes it seem.