The race for the Senate is heading into the homestretch as Republicans seek to maintain their grip on their slim majority.
Democrats must net five seats — or four and retain the White House — to regain control of the upper chamber. They are defending 10 seats, while Republicans face a more challenging path, needing to defend 24 seats.
Here are the Senate seats most likely to flip:
1. Illinois — Mark Kirk (R)
Kirk’s seat is most likely to turn blue this cycle. President Obama won the state by double digits in 2008 and 2012. He faces a formidable challenge from Democratic Rep. Tammy Duckworth.