Originally Posted by Rekna

3) If you aren't registered in advance then your vote should be done as a provisional ballot that gets counted after the registration is validated. This doesn't really open up any extra room for fraud that didn't already exist. In fact I can think of one case where it would actually lesson it. For example today I could have voted in the wrong district because I was registered where I used to live. I didn't but I easily could have, especially since I drove through that area on my way to work. I'm sure many people vote for where they used to live. If there was same day registration they could vote where they currently live.