I just read an interesting recap of and look back at, the past 10 Presidential elections and the Electoral College results.
At the end of the post is a link to an interactive map. Each state is shown as "Solid, Likely or Leans" for a candidate or the state is a "Toss up." Click on a state you think will vote differently than predicted and the Electoral College totals change. Decide your own scenario -- "What if Florida votes for Romney and Ohio votes for Obama, but California...."
It's one of those Win/Win time suckers. Now go play!