New polls for CNN find Vice President Harris building a 6-point lead over former President Trump in Wisconsin and a 5-point lead in Michigan.
The polls, conducted by SSRS, found Harris leading Trump in Wisconsin, 51 percent to 45 percent among likely voters. In Michigan, she led 48 percent to 43 percent.
The showings are better than Harris has fared in other recent polls of the two critical swing states.
In Pennsylvania, the third part of the so-called "blue wall" for Democrats, the two candidates are tied at 48 percent among likely voters, the CNN poll found.
While the percentages from the poll in Michigan did not reveal an increase from a previous survey taken in August, support did increase by 1 percentage point for each candidate in Pennsylvania, going from 47 percent then to 48 percent each now. In Wisconsin, support for both Harris and Trump increased by 1 point in Wisconsin since August, the poll found.
When asked if their choice was more a vote for Harris or more a vote against Trump, 59 percent of likely voters in Michigan said it was for Harris, compared to 40 percent who said it was against Trump, the survey showed.
In Pennsylvania, 58 percent said it was support for Harris compared to 42 percent who said it was more a vote against Trump. In Wisconsin, 62 percent said it was for Harris, while 37 percent said it was against Trump, the poll found.
The margin between likely voters who said their vote was either more a vote for Trump or against Harris was larger, the poll revealed.
In Michigan, 76 percent said their vote was for Trump, compared to 24 percent who said it was a vote against Harris.
In Pennsylvania, 79 percent said it was for Trump while 21 percent said it was against Harris.
In Wisconsin, 79 percent said it was for Trump compared to 21 percent who said it was against Harris, the poll found.
In both Michigan and Pennsylvania, 94 percent of likely voters said that their minds were made up about who they were planning to vote for, a 9-point increase from the August poll, the poll showed. In Wisconsin, 95 percent said the same, also a 9-point increase from the August poll.
The polls were conducted from Oct. 23 to 24 among 724 voters in Michigan, 819 voters in Pennsylvania and 736 voters in Wisconsin.
The margin of error in Michigan was 4.8 percentage points for registered voters and 4.7 points for likely voters. The margin of error in Pennsylvania was 4.7 points for registered voters and 4.7 points for likely voters. The margin of error in Wisconsin was 4.9 points for registered voters and 4.8 points for likely voters.
