A PollSession object looks like:

{
  // The unique identifier for the poll session.
  "id": 1023,
  // The id of the Poll this poll session is associated with
  "poll_id": 55,
  // The id of the Course this poll session is associated with
  "course_id": 1111,
  // The id of the Course Section this poll session is associated with
  "course_section_id": 444,
  // Specifies whether or not this poll session has been published for students to
  // participate in.
  "is_published": true,
  // Specifies whether the results are viewable by students.
  "has_public_results": true,
  // The time at which the poll session was created.
  "created_at": "2014-01-07T15:16:18Z",
  // The results of the submissions of the poll. Each key is the poll choice id,
  // and the value is the count of submissions.
  "results": {"144":10,"145":3,"146":27,"147":8},
  // If the poll session has public results, this will return an array of all
  // submissions, viewable by both students and teachers. If the results are not
  // public, for students it will return their submission only.
  "poll_submissions": null
}