Center-left French presidential candidate Emmanuel Macron compared himself to failed former U.S. Democratic presidential nominee Hillary Clinton in an ad released Friday. The spot is designed to warn French voters Macron could still lose in an upset.

Macron urged French voters to resist complacency and turn out to vote for him against right-wing populist candidate Marine Le Pen and the National Front party. U.S. politics have loomed large in the French contest. On Friday, former President Barack Obama endorsed Macron. Le Pen often has been compared to President Donald Trump, Macron largely had avoided comparing himself to Clinton and her own failed presidential bid until Friday — just two days before the French election.

“The worst is not impossible. Vote.”

“The worst is not impossible. Vote,” warned the Facebook ad posted Friday by the En Marche! party.

The ad showed a clip of Clinton at one of her campaign rallies laughing and smiling while surrounded by a throng of her supporters before pivoting to liberal pundits on television networks who trumpeted Clinton’s inevitable Election Day victory. It also reminded French voters Clinton had been leading Trump in most polls prior to Election Day.

According to Macron and the En Marche! party, French voters who side with them should not lose their sense of urgency just because he leads comfortably in the polls. Macron has led Le Pen by more than 20 percent in most recent surveys.

“To win, Le Pen needs the polls to be way off. That’s possible,” FiveThirtyEight writer Harry Enten wrote in an article published Friday. “Clinton, for example, led [Vermont Sen.] Bernie Sanders in polls of the Michigan Democratic primary by 21 percentage points before Sanders’ shocking win there. But that upset was one of the biggest in U.S. presidential primary history. Polling misses of that magnitude don’t happen very often.”

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The Macron campaign endured a massive leak of hacked emails on Friday, causing many to compare the incident with the massive leaks that plagued Clinton’s 2016 campaign. Several former Clinton aides claimed the hack was once again evidence of Russia trying to undermine western democracies.

“Putin is waging war against Western democracies, and our president is on the wrong side,” former Clinton press secretary Brian Fallon tweeted Friday.

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“For those who thought Russia was dialing back … Macron’s French presidential campaign emails leaked online,” former Clinton campaign manager Robby Mook tweeted Friday.

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Although Trump has not endorsed either candidate officially, he has expressed some affinity for Le Pen.

After a terror attack occurred in France in April, the president tweeted on April 21, “Another terrorist attack in Paris. The people of France will not take much more of this. Will have a big effect on presidential election!”

Le Pen is a fierce critic of the nation’s handling of the threat of Islamic terror.

On the day of the French primary, Trump also tweeted, “Very interesting election currently taking place in France.”