Plugin for having polls in wordpress site.

hi..,
i need a plugin that allow admin to create a poll. Each registered user should be able to answer that and then the result of the poll should be visible in graphical form like bar graph or pie chart. admin should also get which user answer what on which question. every response should be stored in database with all the information like this user answer this on this question. polls should also have an expiry date. multiple responses should be allowed.

Thanks