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I made one from scratch with ASP.Net and SQL Server. The concept would be the same in any language:
You store the findings in a database, i.e., MySQL. When a user visits your site, if you don't find a cookie denoting that he has voted, you display some options and button for him or her to vote. After he votes, and for any with the cookie, you show the poll results instead.
For the results, I just made a couple images a few pixels in size. I sized images to display the results graphically based on the percentage of the total votes for each item.
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