In France's most tumultuous election in years, political uncertainty looks set to continue, whoever wins.
Since taking over the leadership in 2011, Le Pen has sought to soften her party's far-right image, but for many voters the association remains.
After Francois Fillon's demise and Emmanuel Macron's rise, the Russian establishment looks to Marine Le Pen.
The euro currency rose to its highest point since mid-November after Macron was revealed as the winner.
Final results are expected before midnight local time.
The contest's first round has become a tight four-horse race, and trusting the polls is a risky business.
The 2017 French presidential election is probably going to be Europe's most important this year.
It comes as a boost to the leftist Mélenchon, once considered a maverick candidate with little hope of making it past the first round.
Polls suggest Macron will win the presidency in the second runoff round.
Once a frontrunner for the presidency, Fillon's ratings have tumbled under the impact of a scandal.
Benoit Hamon came from a third place position in many opinion polls to win the primary's first round on Sunday.
Opinion polls now put Macron in third place, behind Marine le Pen and Francois Fillon.
The party's primary race is underway, and a candidate will be chosen at the end of this month.
The winner faces a tough fight.
Valls resigned after announcing his candidacy for the 2017 presidential elections.
The first round of voting in the presidential primary will take place Sunday.
A new poll in "Les Echos" sees the French president third in a variety of scenarios.