You would also need an elaborate operation involving tons of people to hijack a blockchain-based e-voting system. The beauty of blockchain is that anybody could verify their own vote on the public ledger (eg. like etherscan.io for Ethereum).
I don't know why people have so much faith in black box paper-based voting systems. There's absolutely no way for any of us to verify that our own votes really went through. If there was vote rigging in Florida or New Mexico in 2000, then none of us would know.
In South Korea's 2012 presidential election (won by Park Geun-hye who's now in jail), there's reasonable reason to suspect that the voting may have been manipulated [1]. There was even a documentary made on it called "The Plan". Even if one dismisses this as mere conspiracy, the reality is that there's absolutely no way for us to verify it.
The move to electronic voting is inevitable, and I long for the day that this is commonplace because then it would enable us to do cool things like direct democracy and liquid democracy.
[1] http://mengnews.joins.com/view.aspx?aId=3032435