The poll also shows the incumbent Ernst has a 4-point advantage over Democrat Theresa Greenfield in the competitive Iowa race for the US Senate.
The Republican Senator was 46 to 42 percent ahead of Iowa voters, the first time Ernst Greenfield topped the poll that year.
Since early summer, Greenfield and Ernst have largely coordinated with the last few weeks Monmouth University survey both candidates are supported by 47 percent of the state’s registered voters.
The poll of 814 likely Iowa voters was conducted October 26-29 by Selzer & Co. of Des Moines. The error rate is plus or minus 3.4 percentage points.
Saturday’s poll contradicts recent polls of Iowa voters, which showed Biden and Trump are in a close race. ONE Monmouth University survey Last week, it was found that 48 percent of Iowa registered voters support Trump and 47 percent support Biden.
Trump’s support in the state has increased among independent voters, while Biden has lost ground among female voters, according to a poll.
While Biden came out on top with independents with 50 to 38 percent in the September poll, Trump has now won them back 35 percent with 49 percent support for Biden.
Biden was 20 points ahead of Iowa female voters in September, but his lead has narrowed to 9 percentage points, according to the poll.
The registry’s pre-election poll was a critical indicator of which candidates will carry the state. Predicting a 7-point lead for Trump over Hillary Clinton in 2016 and a 7-point lead for Ernst over Democrat Bruce Braley in 2014.
Trump won the state with 9.6 points in 2016 and Ernst with 8.5 points in 2014. Trump led the table in the so-called blue wall states of the Midwest and handed over the presidency to him.
Iowa emerged as a critical battlefield in Tuesday’s elections. While Trump won Iowa by a wide margin in 2016, former President Barack Obama led the state in both 2012 and 2008.
Both candidates are visiting the battlefield at the last minute, just days before the election. Biden made a campaign stop at the Iowa State Fairgrounds on Friday, and Trump will hold a rally in Dubuque, Iowa on Sunday.