How to Solve the Swing-State Puzzle

… Using my FiveThirtyEight model, I’ve determined — through about 25,000 simulations that I run each day — which states could put either candidate over the top. …

Which states, then, are the most strategically important? The answer exists along a spectrum rather than in absolutes. Ten states could play an important role in the electoral calculus. I have listed them below, in four groups, along with the chance that each state will be the one that determines the next president. [cont.]

Nate Silver, New York Times Sunday Magazine