In the Senate, Democrats need to add two seats and hold the seats they currently have, a tough feat that puts the party on defense in several states where Trump won in 2016 and remains popular, according to the data.

With predictions of a close race, more Democrats reported stronger feelings about the elections than they did five months ago.

The share of Democrats who said they were “interested” in the midterms rose 11 points since June, to 81 percent, higher than the 73 percent of Republicans who said the same.

Fifty-nine percent of Democrats described themselves as “angry” ahead of the midterms, up 10 points since June and nearly double the 30 percent of Republicans who said the same.

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