From Pew:
The congressional elections are more than four months away, but voter engagement is high when compared with comparable points in previous midterm cycles. And a record share of registered voters (68%) say the issue of which party controls Congress will be a factor in their vote in November.
Compared with recent midterms, more voters also say their view of the president – positive or negative – will influence their vote for Congress. A 60% majority say they consider their midterm vote as essentially a vote either for Donald Trump (26%) or against him (34%). These are among the highest shares saying their view of the president would be a factor in their vote in any midterm in more than three decades.
In early voting intentions, 48% of registered voters say they would favor the Democratic candidate in their district, or lean toward the Democrat, while 43% favor the Republican or lean Republican.
The new survey by Pew Research Center, conducted June 5-12 among 2,002 adults, including 1,608 registered voters, finds that, unlike in recent midterms, voter engagement is high among members of both parties. Overall, 51% of registered voters say they are more enthusiastic about voting than usual, the largest share expressing increased enthusiasm about voting in a congressional election in at least 20 years.