Preliminary Thoughts on the Midterm Elections

The different and constantly changing polls make it difficult at this point to reach a definitive conclusion regarding the midterm election results. Moreover, future events – particularly those occurring in late October and November – almost certainly will have an outsized influence on the outcome.

But even now we can consult certain metrics to determine which party heads into the election with tailwinds, and which party is likely to have to overcome headwinds to win. This white paper examines these cross currents below.

The Senate

As an initial matter, it is important to remember that the party that controls the White House almost invariably loses seats in the midterm elections. This result is true regardless of whether a Republican or Democrat prevailed in the prior presidential election. Of course gaining seats is not the same as taking over a chamber. The minority party must acquire sufficient additional seats to overcome the number of seats by which the majority party holds its advantage.

In this election, the Democrats need to pick up a net two seats to take control of the Senate. Currently the Republicans hold a 51-49 seat majority in that chamber. A Democratic pickup of two seats would flip the 51-49 majority. (A Democratic pick-up of one seat would result in a 50-50 Senate, with Republican Vice President Pence breaking ties.)

A two seat gain seems eminently possible given the tendency of the party out of power to gain seats. This result is bolstered by the current party affiliations, which appear to favor the Democrats:

See Democratic Party Maintains Edge in Party Affiliation, Gallup (December 4, 2017)

But the 2018 election is unusual given the party make-up of the candidates running for reelection. Incumbent Senators running this year were last voted into office in 2012, in confluence with President Obama’s victory that year. Many of those Senators are running from states that now lean Republican.

In total, 35 Senators are up for election this year. Of those 35, 26 are Democrats running for reelection. Of those 26, ten are running from states that voted for President Trump in 2016 (Florida, Indiana, Michigan, Missouri, Montana, North Dakota, Ohio, Pennsylvania, West Virginia, and Wisconsin). Conversely, Democrats have a chance of picking up Republican seats in Arizona, Nevada, Tennessee, and perhaps even Texas.

Although there are many permutations, the Senate math basically comes down to this: to take the Senate, Democrats must win two seats currently held by Republicans as well as the ten states that voted for Trump and the additional 16 states where they are incumbents (or pick up enough additional Republican-held seats to make up any difference). That is not impossible, but it’s much harder than saying the Democrats merely need to pick up two seats to produce a majority.