I believe in mandatory voting because pretty much everyone bitches about politics. If you're not willing to do the minimum of cast a vote (in Aus, that's one each of council, state, federal, every 3-4 years) then you don't really have the right to complain. You may not have a candidate to vote for, but you definitely will have one to vote against.

As for a 'none of the above', on a paper ballot, you can write what you want.

Of course, we have voting well organised - here you won't see queues of eight hours to vote like the debacle in Florida. This is despite mandatory voter turnout and paper ballots.

It's nice though, that you put an evil spin on mandatory voting by labelling it 'coerced'. I wonder if you call traffic lights 'coercion'? I personally think of it more as a citizen's responsibility, but I wouldn't try to colour it by calling it 'responsible voting'.