The election protection site has tons of info, but the App is the most non-partisan element on it. You can check your voter registration status, find your polling place, and report problems with the voting process that you notice. I HIGHLY recommend it! Free of course.
Now for some fun!
One of my favorite apps is not really an election app, but sorta is. Election Indecision is Comedy Central's Election App. Well worth checking out and it actually does have reminders for events, such as the final Presidential Debate, that you can set. Free.
The most potentially useful app to download at this late date in the 2012 election cycle is one that can continue to be used for political research. With Political Time Machine you can easily listen to candidates through time and see what they said when. Yes, you can watch videos of President Obama and Former Governor Romney through time as they speak about issues, but you can also listen to famous political speeches and public events far back into the 20th Century, actually all the way back to 1892.
The app has crashed on me and I had to not just restart the app, but power down and restart the iPad to get it to run again. This crashing may be a buffer issue in my iPad. Fun and educational and it can settle arguments as to whom said what when. And of course it is free.
So these three apps cover my “in the moment” need through the next three weeks, my need for humor, and my need to research past speeches now and in the future. Political apps can be very useful!