While I think Putin is definitely making up shit against this guy to prevent any real opposition, Navalny is probably closer to Trump in his politics than many of you would like. He is closely aligned with nationalist parties and does not like immigrants or any non Russians.
He sees himself as a populist, anti-corruption candidate which I bet Putin and his friends are worried about, seeing as how they are essentially the mafia for their country at this point.
http://www.bbc.com/news/world-europe-15596400
There was an interview today morning on NPR with a lady in the opposition party who sounded pretty defeated, didn't think they had a shot at getting over 10% of anything, and said many Russians no longer believe in voting and think only a violent overthrow will bring about change.