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Democrats — 51

Republicans — 47

Independents — 2

The chart below provides a spectrum that analyzes the vulnerability (the chances of the seat switching parties) of the Senate races up this cycle.

Solid: These races are not considered competitive and are not likely to become closely contested.

Likely: These seats are not considered competitive at this point but have the potential to become engaged.

Lean: These are considered competitive races but one party has an advantage.

Toss Up: These are the most competitive races; either party has a good chance of winning.

Senators with names in parentheses are retiring.

* = potential retirement

† Angus King, who was elected Governor as an independent and is running as an independent to succeed retiring GOP Sen. Olympia Snowe, is the frontrunner. He has said that he will not decide which party he will caucus with in the Senate until after the election. Without knowing which party King will choose, it is impossible to give this race a rating that reflects King's frontrunner status. As such, the race will remain in the Toss Up column.