Presidential vote totals and win margins
Historical Vote Totals and Win Margins
To put Dilma's 2014 win margin in perspective, here is a chart of presidential vote totals since 1989. She beat Aécio by 3.4 million votes (3.28 percent), which would be huge by US standards, but is indeed far narrower than all of Brazil's presidential elections since democratization.
* = Indicates winner
** = Indicates winner in the first round