Rassmussen's newest poll released Friday showed that Republicans maintain a five-point lead in the generic congressional ballot.
Forty-eight percent said they would vote for the Republican candidate, and 43% said they would vote Democrat. Six percent were unsure.
More than half of states are already voting, and some of them have been for weeks already.
Republicans are widely expected to retake the majority in House of Representatives and unseat Nancy Pelosi (D-CA) as speaker.
The outcome in the Senate is more uncertain, with several very close races that are difficult to predict.
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