CNN’s Enten Warns Dems Senate Control Remains Uncertain

Democrats may be ahead in several key Senate races, but CNN chief data analyst Harry Enten says the margins are so narrow that Republicans remain firmly in contention.

Enten described the polling as a “big siren warning sign” for Democrats during a Friday discussion with CNN anchor Sara Sidner. He said “Republicans very much in the ball game,” despite Democratic leads in a number of closely watched contests.

The polling averages Enten showed had Democrats ahead by four points in Ohio, three points each in Michigan and Texas, two points in Maine and one point in Iowa. Kansas was tied. Enten said Democrats likely need to win at least three of those races to take control of the Senate. If the polls matched the final results, Democrats would win a majority.

But Enten then illustrated how a polling miss could change the outcome. In his hypothetical, if Republicans outperformed the polling averages by 3.75 percentage points, the Senate would end up with 52 Republicans and 48 Democrats.

That was a scenario demonstrating the potential impact of polling error, not a prediction that Republicans will finish with 52 seats.

To gauge the uncertainty, Enten compared final polling averages in competitive Senate races, defined as contests within five points. He examined polls conducted during the final 21 days of those campaigns and put the average error at about 3.7 percentage points. Several Democratic advantages in the current map are smaller than that figure.

For Democrats, the gap between leading in a poll average and having a secure advantage remains significant. A narrow lead leaves little cushion if surveys misjudge turnout or voter preferences. For Republicans, the numbers provide grounds to argue that the Senate race is not settled. They do not prove that polling errors will benefit the GOP this year.

Enten likened Democrats’ repeated experience of appearing ahead before losing to Lucy pulling away the football. His broader point was that close polling leads have sometimes failed to hold when votes were counted.

Polling uncertainty goes beyond the published margin of error. The American Association for Public Opinion Research says that margin accounts for sampling error, not other sources of inaccuracy such as nonresponse bias or incorrect assumptions about who will vote. A poll may reach its intended sample and still misread the electorate if some groups are less likely to respond, or if its turnout model is off.

Those limitations do not make polling useless, but they do make confident claims about close races harder to justify. Enten’s historical error measure is also different from the margin of error shown on an individual poll: one compares past polling averages with election results, while the other describes sampling uncertainty.

The stakes go beyond election-night headlines. Senate control affects committee leadership, oversight priorities and the progress of legislation. The majority party holds a majority of seats on each committee, and committee chairs set agendas for committee business. Committees also scrutinize federal operations and proposed legislation.

The Senate also has a constitutional role in confirming presidential nominees, including federal judges and executive-branch officials. That makes control consequential for President Donald Trump’s remaining time in office and for how his nominees and administration’s priorities are handled.