Someone suggested that they'd like the ability to post a comment about why a particular paragraph didn't work for them. That's a good idea. It's always helpful to a writer to know why something worked for a reader, and why it didn't. So feel free to share comments (respectfully) in the comments trail, as well as votes.
To have your comment count as a vote for the paragraph, clearly indicate that it is a vote, as in: I VOTE FOR THIS ONE.
Remember, you may vote for as many paragraphs as you want, but you can only vote for a particular paragraph once.