Check out the link below. I must admit I find this very surprising despite the stink that has come out of Cubdom the last few years. I would have thought the Cubs would at least be in the top half. I have to think the Cubs were one of the most popular teams when I was growing up based on WGN, Wrigley Field and Harry Caray. With more availability to watch other teams and the fact that this team not only stinks, but has become completely irrelevant in the casual sports world, well, I guess they've lost a lot of that popularitiy.
http://www.besttickets.com/blog/most-popular-athletes