"On one side they make: "Well, Biden " s kind of been around too long.' The other side is: 'Biden's naive.' Well, I don't know I've been around a long time and you'd think being around a long time you'd learn a little something, you know", Mr. Biden said, sparking laughs from the crowd.
Biden's gaffe is latest of a string of gaffes Biden has made over the course of the last week.
Since then, Biden has drawn contrasts with more liberal Democrats, like Warren and Sanders, over their proposals to do away with private health insurance and replace it with a government-run system.
Biden's verbal flub at the state fair occurred on the same day that he botched a line in a speech in front of a group of Asian and Hispanic voters in Iowa.
Still, that didn't stop Biden from reportedly repeating the claim.
"He has been durable", said David Axelrod, a longtime political strategist for President Barack Obama.
The good news for Biden, however, is that he continues to hang on to the lead in the poll with 28 percent of support among potential voters in the Iowa caucuses.
Wilson surely has one final chance to prove himself to Liverpool
Liverpool winger Harry Wilson will have a medical at Bournemouth after agreeing a loan move to Eddie Howe's side. Klopp and Liverpool consider him to be a part of the future with Premier League exposure vital to his growth.
Defending himself on Saturday, he told a reporter that he "misspoke" and said, "I don't think anybody thinks that I meant something other than what I said I meant". I've said it 50 - and on the spot, I explained it.
"It's early", Biden said. The shooting suspect in El Paso has been linked to a racist screed that echoed numerous president's own tirades about an immigrant "invasion", prompting at least two of Biden's rivals to brand Trump a "white supremacist".
In Iowa, again, Biden mixed up Theresa May with Margaret Thatcher - again.
For candidates such as Bullock, who are polling near the 1 percent mark, the weeks ahead before the next Democratic debate in September will be crucial to their continued viability.
The Democratic presidential hopeful - who has acknowledged he is a "gaffe machine" - has a reputation for making misstatements on the campaign trail.
On Friday, Democratic candidates such as former U.S. Housing Secretary Julian Castro and outsider candidates Marianne Williamson and Andrew Yang will speak at the fair.
And later in the evening, virtually every member of the crowded field will attend the traditional "wing ding" dinner in Clear Lake, Iowa. During visits Wednesday to El Paso and Dayton, Ohio, Trump repeatedly tangled with his adversaries, including presidential candidate and former Rep. Beto O'Rourke, an El Paso native. That's why Mayor Bloomberg is doing such an incredible job.