Yes there is. Open PollBox control for editing, and expand General section, then choose ResultBox. After that you will be able to edit the ResultBox control public properties (PollBox > ResultsBox (Telerik.Polls.WebControls.ResultsBox))
Expand Appearance and set ShowSeriesLabels
. Note that this property is implemented since Sitefinity 3.7 SP4.
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system and vote to affect the priority of the items