Nate Silver's FiveThirtyEight gives our party a 72% chance of flipping the Senate -- and it could come down to these key races:

Arizona: Mark Kelly 51%, Martha McSally 45%; Maine: Sara Gideon 47%, Susan Collins 40%

North Carolina: Cal Cunningham 45%, Thom Tillis 44%; Colorado: John Hickenlooper 53%, Cory Gardner 42%; Iowa: Theresa Greenfield 47%, Joni Ernst 43%; South Carolina: Jaime Harrison 47%, Lindsey Graham 45%

Will you chip in to the DNC to flip the Senate and elect Democrats up and down the ballot? Yes

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Martha McSally: Derivative of Gage Skidmore Photo. CC BY-SA 2.0

Cory Gardner: Derivative of Gage Skidmore Photo. CC BY-SA 2.0

Joni Ernst: Derivative of Gage Skidmore Photo. CC BY-SA 2.0

Susan Collins: Derivative of Gage Skidmore Photo. CC BY-SA 2.0

Thom Tillis: Derivative of Gage Skidmore Photo. CC BY-SA 2.0

Lindsey Graham: Derivative of Gage Skidmore Photo. CC BY-SA 2.0

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