CBS did a poll of uncommitted voters and asked the following :

Who won the debate? 46% say Biden, 21% Palin

Both candidates had their image improve with the debate but the two most important questions of the night were uncategorically in favor of Biden. 

"Who is prepared to be Vice-President?" Before the debate Biden had 81% but his numbers went up to 97% after the debate. Palin gates a passing grade of 55% (that would be a D- or F+) after the debate, up from 39%.

Yet it is the "Who has the ability to be an effective President?" question that is the killer : Biden was at 66% before the debate. He jumped up to 91%. Palin doesn't pass the test at all having gone up to 44% from a low of 35%.

US Americans are not stupid. Sarah Palin may play cutesy and may have been elected governor of Alaska (grock knows why), but she is not fit to be VP or President of the United States.