Actually not the first poll. Survey USA has been covering them, and support according to them seems to be dropping:
http://www.dailykos.com/storyonly/2005/9/4/22386/57047
I give the Kos link, because the direct Survey USA poll seems to be down at present: Here it is in case it is up by the time your read it: http://www.surveyusa.com/client/PollTrack.aspx?g=2675ae86-5320-4923-bd03-adb3dfe54f6e&x=0,0 (tinyurl for it = http://tinyurl.com/dmzne ) Don't know how Survey USA compares in quality - a phone only daily tracking poll covering 1,200 people per day. Anyway these are its results:
"Thinking just about the President of the United States ... Do you approve or disapprove of President Bush's response to Hurricane Katrina?"
xxxxxxxx 9/4 9/3 9/2 9/1 8/31 Approve 38 41 40 46 48 Disapprove 55 53 53 44 39 -- Please note: Personal messages should be sent to [garlpublic] followed by the [at] sign with isp of [comcast], then [dot] and then an extension of net