The second most popular?

[Com]

I know that Benfica is the most popular club in Portugal but I would like to know is Porto or Sporting the second?


By "popular" I mean the number of supporters.

[SuperFigo]

I would think it would be Sporting Clube de Portugal...
But have no proof to back this up :)

[Terraknux]

I have no Proof, but i think That out of the big 3 Porto has the least supporters. There are quite a few Benfica supporters in Oporto i think.

[Robledo]

I'm sure it's Sporting