For as far as I know, there is no way of using links in the poll, nor is there a way of inserting some formatting directly into the poll itself.

The only way I know would be editing your wiki's CSS to style the poll. It is possible to address certain answers, as they have their own ID's. But you have to keep in mind you have to undo these changes when you want to create a new poll.

Example: Striking through the 3rd answer

#pollAnswer4 label {
    text-decoration: line-through;
Note that pollAnswer4 addresses the 3rd line, Wikia's counting is off somehow.
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