Democratic presidential nominee Joe Biden holds an 8-point lead over President Trump after the two major party conventions, according to a new poll. 

Fifty-one percent of registered voters said they support Biden and his running mate Sen. Kamala Harris (D-Calif.), while Trump and Vice President Pence have 43 percent support, according to a CNN poll released Wednesday. 

The Democrats’ lead doubled since a similar poll from mid-August, when Biden had 50 percent support compared with Trump’s 46 percent, based on the polls. 

The difference in each candidate’s support when compared with the poll conducted before the conventions is within the poll’s margin of error. 

Trump’s approval rating is roughly the same as the previous August poll, with his approval dipping 1 point from 42 percent to 41 percent, and his disapproval rating dipping 1 point from 54 percent to 53 percent. 

Trump’s favorability slightly decreased, from 43 percent to 40 percent, based on the poll, while Biden’s slightly increased, from 46 percent to 48 percent, based on the polls. 

Two other national polls released Wednesday also found Biden extending his lead over Trump after the conventions wrapped up. An Economist/YouGov poll found Biden with an 11-point lead over Trump, and a Quinnipiac University poll found Biden with a 10-point lead over the president. 

The Republican National Convention wrapped up last week, and the Democratic National Convention was held the week before.

The CNN poll was conducted Aug. 28 to Sept. 1 and surveyed 1,106 respondents. The margin of error is 3.8 percentage points.