How can one poll show 6 per cent undecided, and another poll the next day show 49 per cent undecided

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seems a little strange, doesn't it?

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Clemson University Palmetto Poll
11/21/2007

South Carolina
w/o Al Gore
Added: 11/29/07
Margin of Error = 3.6%

Hillary Clinton 19%
Barack Obama 17%
John Edwards 12%
Joe Biden 2%
Bill Richardson 1%
Unsure 49%

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Rasmussen Reports
11/20/2007

South Carolina
w/o Al Gore
Added: 11/22/07
Margin of Error = 4.8%

Hillary Clinton 43%
Barack Obama 33%
John Edwards 11%
Joe Biden 2%
Mike Gravel 2%
Bill Richardson 1%
Dennis Kucinich 1%
Unsure 6%

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Survey USA
11/10/2007

South Carolina
w/o Al Gore
Added: 11/14/07
Margin of Error = 4.6%

Hillary Clinton 47%
Barack Obama 33%
John Edwards 10%
Unsure 5%
Other 5%
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http://www.usaelectionpolls.com/2008/polls/South-Carolina-November-2007.html