Who can be trusted to hold the wallets? The candidates holding it
That was my idea, on live TV, so we can see their faces as their balance goes up 
Seriously though, there are so many things that can go wrong. Paper is much easier and can be checked by much more people than any electronic solution.
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Then there’s the problem of the blockchain developers being the only ones capable of investigating cases of fraud in their own voting blockchain, while there are already procedures in traditional voting systems to alert governments of potential fraud.
It may end up like "The DAO": all "experts" think it's safe, "normal" people have no idea how it really works, and one guy called "The Attacker" really knows how it works and fools them all.