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There are various ways to display acepolls polls to your users, and embedding them into an article is one of them. There is not default functionality to put a poll into an article, but there is somewhat of a work around you can do. Joomla 2.5 allows you to show a module within an article. As you can display acepolls polls with a module, you can put the acepolls module within an article.
To add an acepolls poll within a Joomla 2.5 article: