We were considering this feature for some time, but due to the lack of big demand, we haven't implemented it yet. You can now use the module builder tough, to create your own unique Poll and then use KendoUI for example, for the charting on the front-end.
the Telerik team
Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items