While all eyes are on the presidential race, there also are several key down-ballot races that will determine the balance of power in Congress. Republicans in the House hold a razor-thin majority but Democrats are honing in on a handful of races to help them win back the lower chamber.

Control of Congress is stake this election. Races for the House and Senate will determine which party holds the majority — and the power to boost or block a new president’s agenda. Key contests are playing out alongside the White House race but also in unexpected corners of the country.