Americans love fake holidays. And no holiday is faker than National Flip Flop Day, which falls on the second Friday of June.

So, in honor of this definitely-not-real holiday, here are the biggest flip-floppers of the 2020 Democratic primary (in no particular order):

5. Sen. Cory Booker, D-N.J.: School Choice

Then: The New Jersey senator was once a “rare and invaluable voice supporting educational freedom in the Democratic Party,” as the Washington Examiner’s Brad Polumbo puts it.

Now: Since announcing his candidacy, Booker seems almost embarrassed to have backed school choice. Indeed, as Polumbo adds, the senator’s “campaign website has an entire section entitled ‘Meet Cory,’ laying out a lengthy personal history highlighting all the work he’s done to help people in his career. The words ‘school choice,’ ‘charter,’ and ‘voucher’ do not appear anywhere on the page, despite the fact that he spent years fighting for educational freedom in New Jersey.”

In contrast to his earlier advocacy, Booker is now, “while not completely hostile, a skeptic of charter schools.”

4. Former Vice President Joe Biden: The Hyde Amendment

Then: For more than 40 years, Biden supported the Hyde Amendment, which bars federal funds for abortions. He has supported similar initiatives, including one that he named for himself.

Now: Biden claimed last week that pro-lifers have left him with no choice but to support the position that says the public should fund abortions. He came to this position in the span of a few days, after reversing his support for Hyde, then reversing his reversal, then reversing his reversal of his reversal. His come-to-Jesus moment reportedly came after he was berated by a cable news troll (who now serves as one of his advisers) and a retired child star. Leadership.

3. Sen. Kirsten Gillibrand, D-N.Y.: Everything

Then: Before joining the U.S. Senate, Gillibrand was a pro-Second Amendment immigration hawk.

Now: She is whatever she needs to be to win over an increasingly liberal base.

2. Former Rep. Beto O’Rourke, D-Texas: Wall funding, Impeachment.

Then: O’Rourke voted in 2018 for a $1.3 trillion spending bill that included $1.6 billion for a border wall. Of the funded $1.6 billion, $44.5 million was put aside for repairs of existing border fences, including in O’Rourke’s home of El Paso.

O’Rourke also claimed in 2017 that he supported impeaching President Trump.

Now: MSNBC’s Chris Hayes asked O'Rourke in February: "Would you, if you could, would you take the wall down here — knock it down?"

"Yes, absolutely," said the then-potential 2020 presidential candidate. "I'd take the wall down."

Hayes asked whether he believed El Paso residents would back that move in a referendum.

"I do,” said O'Rourke.

As for impeachment, the former congressman voted against impeachment the two times it was brought to the floor of the House. Between losing his Senate race and announcing his 2020 candidacy, he continued to downplay the idea of impeaching the president. Now he supports it. Just so we are all clear on O’Rourke’s position on impeachment: He was for it, then voted against it, then stayed against it, and now he is for it again.

1. Sen. Kamala Harris, D-Calif.: "Medicare for all"

Then: In January, Harris said of her support for "Medicare for all": "The idea is that everyone gets access to medical care, and you don't have to go through the process of going through an insurance company, having them give you approval, going through the paperwork, all of the delay that may require.”

She added, "Let's eliminate all of that. Let's move on."

Now: The California senator backtracked later, telling CNN’s Jake Tapper that, actually, she supports a more moderate position and insisted she meant she only wants to eliminate “bureaucracy” and “waste.”

Tapper noted that the Medicare for All bill she backs “gets rid of insurance.”

“No, no, no, no, it does not get rid of insurance. It does not get rid of insurance,” the senator said, adding that “supplemental” coverage would be available.

She was right the first time, before her flip-flop. The bill gets rid of insurance.

Honorable Mention: President Trump, who has yet to meet an issue in which he has not played both sides.