The campaign slogan is "Marine Le Pen: Voice of the People, Spirit of France".
Marine Le Pen said Sunday's results showed that "this is no longer solely a protest vote".
She also thinks Marine Le Pen could be an important asset for the party.
On the far right Mr Sarkozy has to confront Marine Le Pen, the telegenic National Front candidate.
Marine Le Pen, the National Front candidate for president, has voiced sympathy for outright exit from the Euro currency.
In France 6.5 million people voted for the far-right candidate, Marine Le Pen.
The assumption is that President Sarkozy is trying to win back votes from Marine Le Pen and the far right.
For the FN leader, Marine Le Pen, it is a now-or-never moment.
From the right, Marine Le Pen will try and exploit all this.
Voting intentions for far-left candidate Jean-Luc Melenchon and far-right candidate Marine Le Pen both gained two percentage points to 17% and 15%, respectively.
Marine Le Pen, who as leader of the National Front attracted nearly a fifth of the first-round votes, has not endorsed either candidate.
CNN: French presidential rivals enter final day of campaigning
Perhaps reflecting that disillusionment, 2 million French voters deliberately spoiled their ballot papers after Marine Le Pen said that was what she would do.
Right-wing politician Marine Le Pen tweeted about her "respect" for him.
By early 2013 America could be ruled by President Rick Perry, France by President Marine Le Pen and Mr Cameron's coalition could have fallen apart.
French left-wing party leader Jean-Luc Melenchon says he will run for the same seat as far-right rival Marine Le Pen in the forthcoming parliamentary polls.
Marine Le Pen's far-right National Front remains an added, unpredictable, threat.
But the idea that the court should rule at all on gay marriage was condemned by the leader of France's far-right National Front, Marine Le Pen.
To see how the FN can punch above its weight beyond its natural strongholds, take a closer look at Marine Le Pen's foot soldiers in Rochefort.
In France, with a stagnant economy and an unpopular president, the polls suggest a rise in popularity of Profile: Marine Le Pen and her National Front.
Earlier this month, two opinion polls predicted that in next year's presidential election, Mr Sarkozy could be knocked into third place by the FN leader, Marine Le Pen.
Recent opinion polls have suggested that Mr Sarkozy would be narrowly beaten into third place in next year's vote by the National Front, now led by Marine Le Pen.
BBC: France: Martine Aubry spurred by Socialist poll victory
Marine Le Pen, taking the lead from her father, has then strengthened the party, although not as much as feared in the first results yesterday night were she was granted 20%.
FORBES: French Election 1st Round: Sarkozy and Hollande Pass the Cut
Analysts had warned that the large share of the vote in the first round for far-right candidate Marine Le Pen, who took 18% of the vote, could mean problems for Sarkozy.
Sarkozy's fate was ultimately sealed by the decision of supporters of Marine Le Pen's anti-immigration National Front party not to vote for him in the second round of the French presidential election.
He said that he had heard the call by supporters of Marine Le Pen for "the nation, borders, authenticity, authority, firmness", and that he shared centrist Francois Bayrou's concern to reduce the deficit.
The far-right National Front is also opposed to the change, although its leader Marine Le Pen stayed away from the march, arguing the issue was a diversion by politicians from France's real problems.
Sarkozy, unpopular personally as well, reverted to familiar protectionist and jingoist bents, goaded further in that direction by the cultural right-winger Marine le Pen, who ran strongly in the initial vote round two weeks ago.
On the campaign trail, National Front leader Marine Le Pen called for France to leave the eurozone and restore its own currency, the franc, as well as criticizing its political integration into the European Union.
France's National Front has long been anti-euro as well as anti-immigrant, and Marine Le Pen's stand against the single currency contributed a lot to her strong showing in the first round of the presidential election.
Sarkozy could use such a boost, as the French presidential election is barely more than a year away and he is trailing not just the likely Socialist candidate, but also far-right candidate Marine Le Pen.
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