(CNN) Democrats now lead Republicans by 52% to 41% in a nationwide generic Congressional ballot according to a new CNN poll conducted by SSRS and released Tuesday. The blue lead has increased slightly from eight percentage points in June of this year to an 11 percentage point difference in the most recent poll.

Despite Democrats' advantage on that measure, a plurality (48%) in the same poll believe Republicans will maintain control of Congress after the election, compared with 40% who believe Democrats will gain control.

Among those who favor the Democratic candidate in their district, 64% say they think Democrats will ultimately win control of Congress, while among those backing Republican candidates, 83% think the GOP will maintain control.

Compared to previous elections, 68% of registered voters say they're more enthusiastic to vote in this election than in the past. Registered Democrats and Republicans report being more excited to vote at similar levels, with 70% and 68% saying so, respectively.

However, Democrats have taken a much higher leap in enthusiasm vs. 2016 than Republicans. When CNN last asked the question, in September 2016, only 38% of Democrats said they were "more enthusiastic," while 48% of Republicans said the same. Registered Democrats jumped 32-points since 2016 and Republicans moved 20-points.

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