Who did they poll? How was the poll conducted?
If it's a phone poll you're going to get old people, no one younger than 40 is going to do a phone poll. And most old people are conservatives.
When it comes to polls, it's very easy to manipulate the results either in how it's done or how the results are interpreted.
If only there were some sort of article you could click on and read which would answer these questions for you. Maybe with a link directly to that poll.