Democrats’ current polling advantage appears large enough to withstand a normal-sized error in the battle for the House. Control of the Senate, though, is far less certain. A Newsweek analysis finds that Democrats would win both chambers if today’s polling averages were exactly right.
They would also retain a narrow Senate advantage if the results shifted 2 percentage points toward Republicans. A uniform 4-point Republican overperformance, however, would result in the GOP maintaining its Senate majority. Even then, Democrats would narrowly win the House, with approximately 220 seats.
If a Democratic lead falls below zero after the adjustment, the race is counted as a Republican win. The Senate calculations use Decision Desk HQ polling averages, while the House estimates begin with its national generic-ballot average. The method is deliberately simple.
Real polling errors do not occur uniformly, and the generic ballot does not translate perfectly into House seats because congressional elections are decided across 435 individual districts. It’s also important to remember that polls are snapshots rather than predictions. Results can differ because voters change their minds, some groups are difficult to reach and pollsters must estimate who will turn out.
The averages on Thursday in the most competitive Senate races can be viewed in the table below. If those margins became the results, Democrats would secure a 53-47 Senate majority. That would mirror the current balance of power, but with party control reversed.
As of Thursday, Democrats also held an 7.9-point advantage in the generic-ballot average used for this analysis. Applying that national environment to the House puts them on course for approximately 235 seats, comfortably above the 218 required for a majority. A two-point shift toward Republicans would bring several Senate races to within a single percentage point.
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