Brazil's crushing defeat in the World Cup will not impact on the elections in October, president Dilma Rousseff said this weekend as she prepares to hit the campaign trail for a second term.

Despite criticism of her government's preparations for hosting the football tournament, Rousseff's poll numbers crept higher recently in the excitement of the month-long tournament. But Brazil's 7-1 trouncing by Germany in Tuesday's semi-finals changed the nation's mood ahead of what is shaping up to be the toughest race since she won power in 2002.