Registered voters say they favor the Democratic candidate over the Republican candidate in their district by 52 percent to 38 percent. That is a marked increase from the four-point edge in an April Post-ABC poll but similar to the 12-point advantage Democrats enjoyed in January…

Self-identified Democrats and Democratic-leaning independents are slightly more likely than Republicans and Republican-leaning independents to say they are absolutely certain to vote, by 80 percent to 74 percent.

Four years ago, when Republicans made gains in the midterm elections, the GOP enjoyed a 10-point advantage on this question in Post-ABC surveys that fall, 71 percent to 61 percent. The latest survey also asked whether people had voted in 2014, and among Democrats and Democratic-leaning independents who say they did not, 63 percent say they are absolutely certain to vote in November.