If Democrats have any chance of taking back the Senate, they will have to win in Arizona. Republican Jeff Flake's retirement opened the seat up, and both sides are already campaigning hard for it. Trump's immigration policies and positions will most likely embolden supporters and detractors to come to the polls in the Grand Canyon State, which he won by only 4 points in 2016. The race is ranked as a toss-up by CNN. Rep. Kyrsten Sinema is the likely Democratic nominee. Republicans will choose between Rep. Martha McSally - whose district is now lean Democrat - former Sheriff Joe Arpaio and former state Sen. Kelli Ward.
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- Results data may not always add up to 100 percent due to rounding.