I don't know what lots translates to in the US, but here in Australian it translates to a ballot paper 1.0 meter wide. The polling booths are 0.6ms wide, so you can lay the thing flat. The number of candidates exceeded our printing technology (or maybe the ballot paper had to fit into the ballot box - I don't know), but its put a maximum size on the ballot paper. The only option to fit every candidate on was to reduce the point size of the print. The had to reduce it to 6 point to make it fit.
Humans can't read 6 point. So the had to issue magnifying glasses so we could read the damned things.
Still, that isn't the problem. We have two more complications. We have preferential voting. This means you have to number every box from 1 to the number of candidates. It works wonderfully well the number of candidates is sane - far better than the US system of first past the post.
Only in the senate the number of candidates isn't sane. It is literally near impossible to mark 100 candidates without duplication or missing a number. To have a hope you have to spend ages double checking and triple checking, and if you make a mistake you can't correct it. Corrections on a ballot paper invalid it. You have to ask for a new ballot sheet and start again, and pray you don't make a different bloody mistake.
Are you getting the idea now? It is clear it is near impossible for a human to make a valid full senate vote? Good. Because what happens next leads us to the current situation, where a man who had a video of him & his mates flinging kangaroo poo at each other up on YouTube during the election got elected to the current Australian federal senate.
Because it is impossible to fill in, they had to simplify it. What they did seems fair enough. They introduced "above the line" voting. To vote above the line you effectively delegate your vote a 1 party. In other words you mark one box. The party has submitted a full senate vote to the Electoral Commission earlier, and that is used as your full preferential senate vote. You can still do a full preferential vote by filling in every square below the line, but you would have to be completely anal.
So, think about it. How do you game this system? If you are a big party it isn't easy, but if you aren't so tied down by ethics you create lots of little parties with confusingly similar names. The Electoral Commission helpfully colludes with you by randomising those names on the ballot sheet. So the voter is confronted to 20 to 30 names of parties most of which he has never heard of before, on a piece of paper so wide he can't lay it flat in the ballot box so he can read them in a single pass. Naturally lots of mistakes are made. The preferential system means if a small party doesn't get in, their votes (which remember they control now) flow to another party of their choice. It doesn't take much imagination to how they might make their choices.
There is one final twist. For the senate, you aren't electing 1 person. You are electing 6. The 1st 5 winners have almost certainly gobbled up more than 90% of the votes, so the last one is determined by tiny fraction.
The really sad part of all of this is while the extra complexity of preferential voting is more than worth it when electing one candidate, it is a complete waste of time when electing 6.
Anyway, don't lecture us Aussie's on how to completely fuck up a voting system. We have all of you beat by a large margin.