While you are right that San Jose experianced its major growth in more recent years, your history is a bit off, San Jose did not grow due to being close to the capital, San Jose was Californias first capital city. It has been an important city in the history of California, even if it didn't get the nation wide recognition.
Anyways, as far as the poll, I'm a little suprized to see SJ at the top of the list, as mentioned by others I think a lot of that must have to due with how good the Sharks have been at home the last few years. The fans are pretty good too though.