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2012 Election Book from NBC News

The NBC News Political Unit has put together a briefing book for Election Day; a guide for users to better understand the upcoming  presidential, Senate, House, and gubernatorial contests.

This nearly 150-page guide offers the NBC News battleground map, information on the most important ballot measures to watch, ad spending tallies, voter turnout history, and past election results.

It also includes an hour-by-hour viewer's guide to the top races in each state, and ponders the question, "What if there's a tie?"

Click the image or click here to check it out.