AFTER two years of Republican government, Americans will go to the polls on November 6th to elect a new Congress. In addition to 35 seats in the Senate, all 435 seats in the lower chamber—the House of Representatives—are up for election. On current data our statistical model of the election gives the Democrats about a three-in-four chance of gaining a majority in the House. On average, we expect the Democrats to win a 13-seat majority.
Source: The Economist