It's a midterm free-for-all: So, which party is the checks and which party is the balances?

We’ve officially reached Election Day free fall: Early voting has already started in many states; millions of people have already cast their votes. Which party will control Congress in 2027 — and what will it mean for President Donald Trump’s second term.

Anything could happen.

The country could wake up after the midterms with a Democratic House and a Republican Senate. 

Election Day could hand Democrats both chambers. Republicans could even hold on to both, though that is the steeper climb. 

Six scant weeks before Election Day, none of those outcomes can be dismissed.

The clearest distinction yet is this: Democrats have a credible route to the Senate; Republicans have a credible route to holding it. Democrats are favored to win the House; Republicans retain a plausible, but narrower, path to holding it.

Part of it is simple math.

Republicans begin with a 53–47 Senate majority. Democrats need a net gain of four seats, which sounds manageable until the races acquire names. 

Former North Carolina Gov. Roy Cooper has led Republican Michael Whatley. Sherrod Brown is trying to return to the Senate in Ohio. Susan Collins faces another difficult race in Maine. But even if Democrats win all three, they need a fourth pickup while protecting their own seats. Alaska, Iowa and Texas offer possibilities; Michigan and New Hampshire offer Republicans opportunities to spoil the Democratic plan. 

Cook Political Report rated seven Senate contests toss-ups as of September 23.

The House presents different arithmetic. 

The Republican majority is so narrow that Democrats need only a few net gains. National polls ask voters which party’s congressional candidate they prefer, and the recent answers favor Democrats. 

Silver Bulletin’s September 25 average put the Democratic lead at 8.1 points. One Marist survey found a wider 12-point lead, while other polls have found smaller margins. 

None is an Election Day count, but taken together they describe a headwind Republicans must confront in district after district.

That does not mean the polls deserve blind faith. 

In the last three presidential elections, final surveys understated Republican support — significantly.

Who can forget the spectacular 2024 Iowa poll that placed Kamala Harris ahead shortly before Trump won the state by more than 13 points? That episode — and others — remains a fair reason for skepticism. 

This summer, an operation called Median Strategies acknowledged publishing fabricated polls — after the election, naturally. Voters who question polling and the headlines built around it have reasons to do so.

The caution runs in both directions. The polling profession’s review found much smaller average directional errors in the 2018 and 2022 midterms than in the recent presidential elections. It would be rash to assume every Democratic lead is real to the decimal point. It would be equally rash to erase every lead by applying an automatic Republican correction. Polling error is a risk to a forecast, not a substitute for one.

Republicans also have advantages the generic ballot cannot measure. 

New congressional maps have improved their position in some states. GOP committees and allied groups have money to spend, and a strong local candidate can survive a difficult national year. Democrats, meanwhile, have to persuade voters to choose their particular nominees, including in places where Trump won comfortably. 

Put simply, a national Democratic lead does not distribute itself neatly among 435 districts.

Still, the burden is greater in the House. 

Republicans need to defend a slim majority while voters express dissatisfaction with prices and the administration’s handling of the economy. 

In the September Marist poll, independents favored Democratic congressional candidates 57% to 32%. A Republican recovery is possible, but it has to occur among actual voters in enough competitive districts — not merely in arguments about why the polls might be wrong.

What would divided control mean in 2027? A Democratic House could investigate the administration, challenge its spending priorities and block legislation it opposes. A Republican Senate could continue confirming Trump’s nominees and prevent House Democrats from turning their preferred bills into law. Both parties would claim to be the check on the other. Neither could govern alone.

A Democratic sweep would put a much stronger brake on Trump’s legislative agenda and nominations. A Republican hold would preserve his party’s ability to advance them, though narrow margins would still give individual lawmakers considerable power. These are consequential choices, especially for voters weighing the economy, the Iran conflict and the direction of the country.

Republicans still have time to make a case that conditions are improving and that a change in congressional control could interrupt progress. Democrats have time to argue that Congress has failed to hold the administration accountable.

The Constitution does not assign one party the permanent role of “checks” and the other the role of “balances.” Voters decide who holds power; the institutions determine how that power is constrained. In 2027, they may choose divided government — or they may give one party control of Congress. 

Also, anything could happen to change the dynamics of the race in the coming weeks. We haven’t even reached the point of prime October surprise yet.

For now, both parties have a path, and both still have to earn it.

(Contributing writer, Brooke Bell)