Comment: Representative Proxy Votes (Score 1) 226
You'd also run into vocal minorities, which would be especially heavy as time wore on. John Q. Public doesn't really want to vote on every single bill or issue that arises, that's why he's happier with a republic than a direct democracy.
You could counter this by giving the representative one proxy vote for each citizen who doesn't cast a ballot on each issue. This would however mean that the representative stays in control unless 50-75% of citizens cast individual ballots on an issue. So you could tweak it to dial down the weighting of representative votes as participation rates increase.
The security of online voting doesn't concern me as much. There is however an insoluble choice between anonymity (the secret ballot) and making it easy to buy and sell votes. But attendance at a polling booth isn't a perfect system either.