As the battle for the Senate heats up with post-Kavanaugh polls forecasting a Republican resurgence, The Circus travels the country charting the shifting dynamics in three of the closest races - each considered a must-win if Democrats hope to gain the majority. In Arizona, it's neck and neck between Kyrsten Sinema and Martha McSally; in Nevada, Jacky Rosen digs deep to take on incumbent Dean Heller; plus, a sit-down with North Dakota's Heidi Heitkamp, who's fighting for her political life in the wake of a campaign ad controversy.

Donald Trump has hit the campaign trail in a big way to aid Republicans in their election efforts, and he is painting frightening pictures to motivate his base. In response, prominent Democrats are issuing dire warnings of what will happen if their party doesn't retake at least some control. With the midterm elections only days away, The Circus travels to rallies and campaign stops around the country to find out how both sides are pulling out all the stops to win these all-important races.