The Workers Party candidate is the front runner and poised to become Brazil's first female president. But she first has to capture the most votes in the Oct. 31 runoff election.
President of Costa Rica. Elected in May of this year.
President of Argentina. 2007-present
President of Chile. 2006-10.
President of Panama. 1999-2004.
President of Nicaragua. 1990-97.
President of Argentina.1974-1976
Dilma Rouseff became the first female president of Brazil and the seventh female president of Latin America. Here are the others.