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24 October 2011 Last updated at 00:48 GMT
The victory celebrations began almost as soon as voting ended Argentine President Cristina Fernandez de Kirchner is heading for a landslide general election victory, according to partial results. With 15% of returns counted, Ms Fernandez had won 53% of vote, enough to win re-election in the first round.
Her closest challenger - the socialist Hermes Binner - had just 17%.
Thousands of Ms Fernandez's supporters are celebrating in the historic Plaza de Mayo in Buenos Aires, chanting and waving flags.
If confirmed, the victory margin would be the biggest since Argentina returned to democracy in 1983.
Ms Fernandez, 58, has presided over strong economic growth and introduced popular social policies.
The sudden death of her husband, former president Nestor Kirchner, a year ago brought her a wave of public sympathy.
Her critics say she has also benefited from a weak and fragmented opposition in this election.
Still dressed in black in a sign of mourning, Ms Fernandez referred to her husband as she cast her vote in Rio Gallegos, her home town in the far south of Argentina.
"I can't say it is a happy moment because I would be lying," she said.
"He [Mr Kirchner] must be very happy that people are voting, wherever he is."
Ms Fernandez may also regain control of Congress, which she lost in mid-term elections in 2009.
Nearly 30 million voters were choosing who will fill 130 seats in the lower house of congress, 24 senate seats and nine governor's offices as well as hundreds of local seats.
High inflationA landslide victory would mark a dramatic change of fortune for Ms Fernandez, the BBC's Vladimir Hernandez in Buenos Aires says.
Continue reading the main story Cristina Fernandez Hermes Binner - governor of Santa Fe Ricardo Alfonsin - Radical Party, congressmanAlberto Rodriguez Saa - governor of San Luis Eduardo Duhalde - former caretaker presidentFollowing her election in 2007, her public support quickly plummeted to around 20% after rows with farmers and media groups over of the introduction of exports quotas.It was often suggested, during her early years in office, that it was her husband who was really running the country.
Nestor Kirchner was president from 2003 to 2007 and stood aside to let his wife run for office to succeed him.
He was widely expected to run again for the presidency in 2011 until his sudden death from a heart attack last October.
Political analysts say Ms Fernandez's current popularity is mostly due to the health of the economy, which has boomed thanks to high prices for exports such as soya.
She has also carried out social programmes - such as benefits for three million of the country's poorest children - which have proved extremely popular.
But her critics accuse her of pursuing populist policies, and question whether such programmes can be sustained.
She has also been accused of downplaying the scale of inflation, which is now the second highest in Latin America, behind Venezuela.
