With the election tomorrow, Mike Bostock and Shan Carter for the New York Times map the 512 possible paths to the White House. Select state wins, and the paths update accordingly. For example, select an Obama win in Florida, and it doesn't look good for Romney.
If Mr. Romney loses Florida, he has only one way to victory: through all the other battleground states. He has led most polls there, however, and is the favorite. If Mr. Romney wins Florida, he has 75 paths open to him.
The interaction feels game-like.