Rasmussen, June 22, 2010:

U.S. voters think Hillary Clinton is more qualified to be president than Barack Obama, but most believe that both Democrats are more fit for the White House than three top Republicans interested in the job. A new Rasmussen Reports national telephone survey shows that 57% of voters feel Clinton is qualified to be president, but 34% disagree and say she is not. As for President Obama, 51% say he is fit for the job. However, 44% say he is not qualified to be president, even though he has now served 17 months in the job.

CNN Poll, November 2007:

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CBS Poll, January 2007:

Obama is also seen as a strong leader, but there are doubts — nationally and within his own party — about whether he has enough experience. About three in 10 Americans, and the same number of Democratic primary voters, doubt he can be elected.

Amazing how two years as president can make you look like a junior senator again.