People are perpetually popping up in all my media streams insisting that online voting is the way forward. It seems so obvious. And yet, it's simultaneously completely wrong. If you think that online voting is a good idea, you must (seriously, you have to) watch this video.
Realise that just about every other democracy uses a system similar to the US' (in theory at least, and only for the actual vote).
For people who care about, support, or build Free, Libre, and Open Source Software (FLOSS).