The conventional wisdom is that the Democratic Party has the advantage in the 2026 midterm elections and could become the majority party in one, or both, chambers of Congress. The margin of that anticipated victory is harder to predict.
And the size of a party’s majority makes a difference. To see why, it’s worth looking back to the second half of the 19th century, when two dramatic midterm election results marked the beginning of important eras in the nation’s history.
