Via the BBC: Argentina elections: Voters pick new president.
Candidate basics:
President Cristina Fernandez de Kirchner has served two consecutive terms and, under Argentina’s constitution, cannot run again.
Her hand-picked successor, left-winger Daniel Scioli, is leading polls.
But he is expected to face stiff competition from Mauricio Macri, the centre-right mayor of Buenos Aires.
Another candidate, Sergio Massa, a former Kirchner ally, is polling behind Mr Macri, while there are three other names on the ballot paper.
And, of course, Kirchner’s husband was president before her, so it has been a while since a non-Kirchner was chief executive of Argentina (since 2003, in fact).
The rules:
To win outright a candidate needs 45% of the vote or a minimum of 40% as well as a 10-point lead over the nearest rival.
Otherwise, there will be a run-off on 22 November.
Side note: Argentina has a federal system and used an electoral college to elect the president until 1994 (one of the few such example outside the US).









