I am also interested in having the polls questions and answers in Twitter Stream APIs. Although it will be like retweet and favorite numbers almost always zero because they are just streamed, it would be very helpful to know the question and the options for answers.
Polls on Twitter will allow users to just tweet for the sake of polling purposes. Therefore, if the stream contains these tweets without the poll details it will reduce the productivity of those tweets and harder to analyze.
Great idea and thanks for being open to having it in your APIs.