More U.S. adults would rather see Democrats maintain the House majority in 2020 than would like to see a GOP takeover, according to a new poll.

49 percent of respondents told a Economist/YouGov survey published Wednesday that they would vote for a Democratic candidate in next year's elections, while 38 percent said they would vote for a Republican candidate.

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Democrats hold just a 1-point advantage over Republicans among adults who identified as independents in the poll, and held clear leads among all age groups except seniors over 45, who were split 45-44 in favor of the Democrats.

White voters surveyed in the poll narrowly broke for Republicans, 45 percent to 42 percent for Democrats, while African Americans overwhelmingly (80 percent) said they supported the Democratic candidate in their districts.

Only 9 percent of respondents said they were undecided, while 2 percent planned to not vote. However, nearly a quarter (24 percent) of independents say they remain undecided.

The Economist/YouGov survey contacted 1,500 U.S. adults, and the poll's margin of error is 3 percentage points.