Southerners are not too stupid to know Obama is an American, the poll was done by Daily Kos

Rush ranted on: September 24, 2009,
"That poll was done by the Dailykos.

Wikipedia:
Daily Kos (pronounced /ˈkoʊs/) is an American political blog, publishing news and opinion from a liberal or progressive point of view."

Kos didn't do the poll. Kos had RESEARCH 2000 do the poll. RESEARCH 2000 is a respected nonpartisan firm
"RESEARCH 2000 is a nonpartisan full service research firm that conducts surveys and focus groups for advocacy groups, trade associations, businesses and over 200 news media organizations"
http://publicdiplomacy.wikia.com/wiki/Research_2000

"According to a new poll from Research 2000 (commissioned by Daily Kos), a majority of Southerners either believe that Barack Obama was not born in the United States (23 percent) or are not sure (30 percent). Only 47 percent of Southern respondents believe Obama was born in the USA. By contrast, 93 percent of Northeasterns said yes, he was born here, 90 percent of Midwesterners did and 87 percent of Westerners."

"And while 93 percent of Democrats say he was born in the country and 83 percent of Independents, the figure is only 42 percent for Republicans. A majority of Republicans either believe he was born abroad (28 percent) or don't know (30 percent)."
http://www.usnews.com/blogs/robert-schlesinger/2009/07/31/poll-on-birthers-most-southerners-republicans-question-obama-citizenship.html