What about the unfair advantage the incumbents have? Speaking as an outside observer, this seems like a clear case of election interference - but from the big parties, not from whoever this no-name guy happens to be.
The fact that the incumbents performed poorly during the past 4 years has led to them having a lot fewer %s in the parliamentary elections, and I think it was the first time that one of the establishment parties' candidates didn't manage to pass the first leg of the presidential elections.