The result of France’s presidential election will have a big influence on the EU — but some Brussels-based French politicians are also playing a significant role in the campaign back home.

Here, POLITICO takes a look at some of the friends, allies and influencers of the leading five candidates who work in EU institutions.

These surrogates campaign for their candidates, help draft EU strategy and build networks with foreign parties and politicians. And if their champion is elected as François Hollande’s successor, they will be at the heart of the next president’s political machine.

If you happen to be traveling on the high-speed Thalys train that links Brussels and Paris, these are the power players to look out for as they shuttle between capitals:

Jean Arthuis & Sylvie Goulard (Supporters of Emmanuel Macron)

Jean Arthuis, 72, is a former economy and finance minister who became an EU lawmaker in 2014 and chairs the European Parliament’s budget committee. He was one of the first centrist politicians to endorse Macron in early 2016 and has since helped the independent candidate get to know several EU leaders. If Macron, the current favorite, wins the presidency, Arthuis may not land a ministerial post but he could be one of the so-called “visiteurs du soir” — a group of informal advisers who visit the Élysée Palace in the evening to dine with the president.

Sylvie Goulard, 52, is a more high-profile Brussels figure. A centrist MEP since 2009, she was previously an adviser to Romano Prodi when he was European Commission president. Goulard has helped promote the Macron brand not just in Brussels but also in Berlin. She told POLITICO she had put Macron in contact with leading German diplomats and politicians in recent months. She could well take a ministerial role in a Macron administration.

(It’s also worth noting that economist Jean Pisani-Ferry, a former European Commission official and co-founder of the Brussels-based think tank Bruegel, became Macron’s top adviser on economic policy and budgetary issues in January.)

Ludovic de Danne & Edouard Ferrand (Marine Le Pen)

Le Pen has been an MEP since 2004 but rarely attends the Parliament’s sessions in Brussels or Strasbourg — like other senior MEPs from her National Front party such as Florian Philippot, Louis Aliot, Steeve Briois and Nicolas Bay.

But Ludovic de Danne, 42,  is definitely at the heart of Le Pen’s networks in Brussels. A former parliamentary assistant, he is now the secretary-general of the Europe of Nations and Freedom parliamentary group — a gathering of far-right MEPs co-chaired by Le Pen herself. De Danne worked behind the scenes for a year to set up the group.

Edouard Ferrand, 51, is the head of the National Front group in the European Parliament, in charge of its 20 members. “Unlike the heavyweights in the party, he is here and he is working,” said a senior center-right MEP.

Alain Cadec & Michel Dantin (François Fillon)

Alain Cadec, 63, has been an MEP since 2009 and now chairs the Parliament’s fisheries committee. He has been in Fillon’s close entourage for more than two decades as both were affiliated with Philippe Séguin, a former speaker of the French National Assembly. Even if Fillon calls the shots on what goes into his program, Cadec played a major part in drafting Fillon’s EU proposals. Cadec is also the president of the Côtes-d’Armor département.

Michel Dantin, 57, has also been an EU lawmaker since 2009 and endorsed Fillon when he was running what seemed like a long-shot bid to win the French conservatives’ presidential nomination last year. Dantin is also mayor of Chambéry, a town of 60,000 inhabitants in southeast France. Even if he is not part of the candidate’s inner circle, he is very influential on agricultural policy within the Républicains party and could take that ministerial portfolio if Fillon wins the presidency.

Sophie Rauszer & Younous Omarjee (Jean-Luc Mélenchon)

Mélenchon has himself been an MEP since 2009, but the leader of the France Insoumise (“rebellious France”) movement has not made much of a mark on Brussels as he is not really involved in the politics of the European Parliament.

Nevertheless, he has a team in Brussels working on his behalf. Sophie Rauszer, 29, a former aide to Mélenchon, is now a political adviser to the radical left GUE/NGL group in the European Parliament. Rauszer took part in drawing up Mélechon’s program but the candidate himself has written books on European issues and took the lead in formulating EU strategy. Rauszer is also running for the parliamentary election to represent French voters in the Benelux region.

Younous Omarjee, 47, an MEP from La Réunion, is helping Mélenchon on French overseas territories policy. The candidate’s camp also notes it has radical left allies from other countries such as MEPs Fabio De Masi of Germany and Italian Barbara Spinelli, who have attended Mélenchon rallies and are helping him spread his message.

Guillaume Balas & Isabelle Thomas (Benoît Hamon)

Socialist Guillaume Balas, 44, has been an MEP since 2014 and is a long-time backer of Benoît Hamon. He was a leader in Hamon’s faction in the Socialist Party and has been the coordinator of his political program since the primary campaign.

Isabelle Thomas, 55, is another long-time backer of Hamon in the Socialist Party. She joined the European Parliament in 2012 is now vice president of the Socialists & Democrats group. Alongside French economist Thomas Piketty, she drafted Hamon’s EU wish list, which includes a eurozone budget and a new parliamentary assembly for the euro area.

Bubbling Under: Pierre Moscovici

Although he has not publicly endorsed any candidate, European Commissioner Pierre Moscovici is also playing a role in the campaign. The veteran Socialist politician, whose portfolio in Brussels includes economic and financial affairs, has spoken out strongly in favor of pro-EU policies and against Le Pen’s desire to take France out of the bloc.

“Europe is France’s future, and we need France to be a driving force,” he said at a press conference in March. “I don’t even talk about those crazy ideas of France leaving Europe, which would both kill Europe and make France choke severely.”

He has also taken a swipe at Fillion, who said during the conservative primary he had “no respect” for Moscovici, “a finance minister who failed in everything and a European commissioner spending all his time on French TV and radio stations.”

Moscovici made his career in the Socialist Party and has said he will “respect” the outcome of the Socialist primary won by Hamon. But many see his political outlook most closely reflected in Macron’s platform. Like Macron, Moscovici served as economy and finance minister under socialist president Hollande. He has continued to meet regularly with Hollande even after moving to Brussels and is sure to remain a player in French politics.

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