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.
Marine Le Pen, the far-right National Front leader, paid tribute to Mr Venner, describing his suicide as a political gesture aimed at "waking up the people of France".
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.
It is also worth mentioning that it is now easier for one to vote Front National as Marine Le Pen is somewhat more moderate than her father who was seen as a fascist.
FORBES: French Election 1st Round: Sarkozy and Hollande Pass the Cut
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.
Voter discontent surfaced on April 22, when nearly a fifth of the electorate cast ballots for far-right leader Marine Le Pen, who had campaigned on anti-immigration and protectionist proposals including doing away with the euro.
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.
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