Nate Silver unveils his Senate race ranking model:
Between the surprise in Massachusetts, and races like California and Indiana which are potentially coming into play, there's about a 6-7 percent chance that Republicans could actually take control of the Senate, and another 6 percent chance or so that they could wind up with a 50-50 split. On the other hand, there's still a 7-8 percent chance that the Democrats could regain their 60th seat if the national environment shifts back in their direction.
The Dish 