With the 2018 midterm election three weeks away, the Democrats need a 23-seat pickup in the House of Representatives to reach the 218 seats (of 435) necessary to gain majority control, and all seats are up for election. RealClearPolitics, a polling aggregator, currently has the “over/under” pickup odds at plus 24.5 seats for Democratic candidates (see below).

Based on the above, 101 seats are in play to some degree with 29 rated as toss-ups. All of the latter are held by Republican incumbents, which stacks the odds in the Democrats’ favor. In the Senate, 51 seats are needed for a majority. With the vice president as the tie-breaking vote, however, Republicans would only need 50 seats for the next two years. There are 3...