Joe Biden mangled another soundbite on Thursday as he launched a broadside at Donald Trump at the Iowa State Fair.

Biden's standard campaign line is: 'We choose science over fiction, hope over fear, and unity over division.'

But that's not what he said at the end of a Des Moines speech, while addressing Iowa fair goers.

'Everybody knows who Donald Trump is. Even his supporters know who he is. We gotta let them know who we are. We choose unity over division. We choose science over fiction. We choose truth over facts,' he said.

He referred to himself as 'President of the United States' later while responding to a question from DailyMail.com about gun control.

Joe Biden mangled another soundbite at the Iowa State Fair on Thursday as he launched a broadside at Donald Trump

Biden uncharacteristically stopped short of filling the 20 allotted minutes that candidates have to speak atop the soapbox, which is actually a riser surrounded by hale bales these days

Biden's standard campaign line is: 'We choose science over fiction, hope over fear, and unity over division'

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In a bit of irony, he followed up his initial attack on Trump, which came at the end of his 18 minutes of remarks, with an admission that his campaign needs help, if he's going to prevail in the race.

'And so folks, if you're interested, join me. I could use the help, because we must, must, must defeat this president to change the trajectory of this country,' he said.

Biden uncharacteristically stopped short of filling the 20 allotted minutes that candidates have to speak atop the soapbox, which is actually a riser surrounded by hale bales these days.

He teased the crowd as he concluded his remarks, 'Don't let anybody know I didn't use all my time. I have a bad reputation of going over all the time.'

The former vice president traded hale bales for a covered tent to address reporters immediately after his remarks.

He told them, in response to a question about he'll energize Democrats, to simply 'look at the polls,' which have him ahead of every other candidate.

'No one's ever doubted, including reporters who cover me all the time, no one's ever doubted I mean what I say. The problem is sometimes I say all that I mean,' he said.

The former vice president traded hale bales for a covered tent to address reporters immediately after his remarks

And he went on a tour of the fairgrounds, stopping to talk with several young children

At 76, he is one of the oldest candidates in the race, and his gaffes and low-energy speeches have earned him the nickname 'Sleepy Joe,' from Trump, who's only three years his junior and makes his fair share of rhetorical errors

Biden said it's his belief that voters are 'looking for authenticity, they're looking for honesty, they're looking for someone who has new ideas about how to deal with these things,' and his longevity in American politics gives him in advantage in that arena.

He ran for president two times prior to his selection as Barack Obama's running mate in 2008. Biden served as vice president for eight years after that and was expected to seek the presidency for a third time in 2016 when his son, Beau, contracted brain cancer.

His son's illness and death put an abrupt halt to the ex-Delaware senator's political aspirations.

Biden says he decided to seek the presidency in 2020 because he 'can afford to do it now' based on the public and financial support he was able to amass.

'It's way early on. I know the polls have me ahead by 10 or 12 points to the next person, but it's early, it's really early,' he said. 'I plan to be here to earn the vote of Iowans.'

At 76, he is one of the oldest candidates in the race, and his gaffes and low-energy speeches have earned him the nickname 'Sleepy Joe,' from Trump, who's only three years his junior and makes his fair share of rhetorical errors.

After Biden was mocked for mistakenly saying at a fundraiser that mass shootings took place in Houston and Michigan, instead of El Paso and Ohio, the president told the nation to pray for the city of Toledo, when he meant to say Dayton.

Trump denounced white supremacy in the national address that he read off at telemprompter, answering a demand from his critics to condemn the ideology that drove an El Paso shooter to kill 22 people.

'Talk about sleepy, he was awful sleepy in the way in which he talked about it,' the former vice president told reporters in Iowa on Thursday afternoon.

At the end of the informal question and answer session, Biden made one other mistake, though. He referred to himself as 'President of the United States' - an elected office that he is seeking but has never actually held.

The question was on gun violence prevention, and what makes him the right person to enact new reforms.

'Because I've done it before. As President of the United States, I've done it. I met with every one of those Sandy Hook family members. Every one of them. I met, the same, with every one of the Pulse, the people who got killed in the Pulse nightclub,' he said of an Orlando shooting that took place several months before he and Obama left office.

Biden was Vice President of the United States at the time of the massacre.

'I met with every one of those kids down in Florida, that in fact were in that. So, I understand it. People know I know it. People know I understand it. I've beaten them before, and I can convince - I can rally support to beat them again,' he insisted.

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