Of 600 likely voters in Michigan asked September 30 to October 3, 48 percent would back Biden, compared to 39 percent for Trump.

The results of this Detroit News/WDIV-TV poll showed Biden’s lead increased from similar polling around a month before, when he was five points ahead of the Republican incumbent.

The latest polling, which has a margin of error of plus or minus four points, also showed Biden ahead by eight points among voters aged 65 or older.

This survey was conducted following the recent debate between Trump and Biden.

According to FiveThirtyEight’s tracker, Biden has a 7-point lead in the state of Michigan. Real Clear Politics’ tracker puts him 5.8 points ahead of Trump.

Biden recently visited the state, where he was greeted by Trump supporters chanting “four more years,” during which he outlined details of his economic vision if he were to become president.

Trump also held a rally in the state last month, which was criticized due to attendees not wearing masks.

Trump won Michigan by just more than 10,000 votes, or around 0.3 percent of the vote, according to figures reported by The New York Times.

The Democratic candidate had won in the state in six straight elections, from 1992 to 2012, prior to this point.

Upsets in such states were key to Trump’s Electoral College win in 2016, which saw him elected president despite having lost the popular vote.

Newsweek has contacted the Trump and Biden campaigns for comment on the state of polling in Michigan.

Polling in swing states this time out however points towards victories for Biden in both the popular vote and the Electoral College. Trump is also polling worse at this point than he was against former rival Hillary Clinton at a comparable time in 2016.

Biden is currently leading in national polling, with an average lead of 8.2 points, according to FiveThirtyEight.

The increase in the gap in the Michigan polling following the debate reflects a trend also seen in national polling, which also showed the points between Biden and Trump increase.

Separate polls following the debate largely showed that people judged Biden as the winner, though the whole event faced criticism. Vice President Mike Pence and Democratic vice presidential candidate Kamala Harris are due to debate Wednesday.