The survey shows familiar partisan splits on some issues. Voters listing the economy and taxes as top concerns express a solid preference for Republicans, while those who cite health care strongly favor Democrats.
But the poll suggests events during the Trump presidency, from recent school shootings to his policies on the Mexican border, have shifted the terrain for other issues.
Voters citing the importance of guns — traditionally a source of GOP enthusiasm, favor Democrats for Congress by 58 percent to 33 percent. Those citing immigration favor Republicans by just 5 points, 49 percent to 44 percent.
One persistent challenge for Democrats remains motivating the young voters who favor them to show up on Election Day. The share of voters 50 and older expressing high interest in the election (67 percent) more than doubles the share of those aged 18 to 34 (30 percent).
Another is the unpopularity of House Democratic Leader Nancy Pelosi. By 45 percent to 21 percent, voters say they'd be less likely to back a congressional candidate who would support Pelosi as speaker.
Republicans, as the party in power now, have bigger challenges. Just 32 percent of voters say their representative in Congress deserves re-election, while 53 percent want to give someone new a chance.
That's comparable to findings in 1994 and 2010, when Republicans won the House, and more promising for Democrats than in 2006, when they recaptured Congress. The telephone survey of 900 registered voters, conducted June 1-4, carries a margin for error of 3.27 percentage points.