FiveThirtyEight has released its gubernatorial forecasts. They say Brown will win by 9.7%–an outcome that would thrill Democrats in an increasingly hot contest.

Nate Silver’s forecast of a solid Brown win is squarely at odds with Charlie Cook’s forecast of a very tight race with an edge for Brown. It’s a great face off between people often regarded as the nation’s top polling aggregator and top political analyst.

We’ll find out who is closer to being right on Tuesday.