I also noticed that the trust in Volen Siderov (or as we call him for fun "the Furer":)) is increasing. He seems to be persuasive for my surprise. I think it is all because he touches a very sensible issue for the Bulgarians- their national identity. And since Bulgarians have some inborn hatred towards Turks (because of the five century slavery in the past) it is easy to manipulate mediocre people that are in need of something to believe in.

 As far as I noticed his supporters are not quite intelligent. I watched the rally you mentioned (on the 3rd of March) and the regional representatives that talked in front of the people were, I would dare to say, uneducated.

Generally, I don't think he will succeed in overthrowing the government or let alone become a president.