The document summarizes polling data from multiple Brazilian polling organizations between 2008 and 2010 on voting intentions for Dilma Rousseff and José Serra in a potential presidential runoff election. It shows Rousseff increasing her lead over Serra over time, with support for Rousseff ranging from 4.5% to 41% and support for Serra ranging from 31.3% to 39% across the various polls conducted during this period. Undecided voters and support for other candidates decreased from 2008 to 2010 as the election approached.

1. Pesquisa das Pesquisas (Poll of the Polls)
Cenário 1 Serra X Dilma
Ponto a Ponto
Dilma Rousseff José Serra Outros Indeciso
2008 13-16/Fev/08 Sensus 4.5 38.2 31.3 26.1
25-27/Mar/08 DataF 3 38 34 27
21-25/Abr/08 Sensus 6.2 36.4 28.6 29.0
15-19/Set/08 Sensus 8.4 38.1 27.3 26.3
25-28/Nov/08 DataF 8 41 29 21
08-12/Dez/08 Sensus 10.4 46.5 12.5 31.8
10-14/Dez/08 Ibope 5 42 29 25
2009 26-30/Jan/09 Sensus 13.5 42.8 11.2 32.6
16-19/Mar/09 DataF 11 41 27 21
23-27/Mar/09 Sensus 16.3 45.7 11.0 27.0
26-28/Mai/09 DataF 16 38 25 21
25-29/Mai/09 Sensus 23.5 40.4 10.7 25.6
29-01/Jun/09 Ibope 18 38 19 25
11-13/Ago/09 DataF 17 36 29 18
31-04/Set/09 Sensus 19.0 39.5 14.5 27.2
11-14/Set/09 Ibope 14 34 28 23
16-20/Nov/09 Sensus 21.7 31.8 23.4 23.2
26-30/Nov/09 Ibope 17 38 19 25
4-7/Dez/09 Vox/IstoÉ 17 39 21 24
11-14/Dez/09 Vox IstoÉ 18 39 25 18
14-18/Dez/09 DataF 23 37 21 19
2010 14-17/Jan/10 Vox 27 34 17 22
25-29/Jan/10 Sensus 27.8 33.2 18.7 20.4
6-9/Fev/10 Ibope/DC 25 36 19 20
24-25/Fev/10 DataF 28 32 20 19
6-10/Mar/10 Ibope/CNI 30 35 17 18
25-26/Mar/10 DataF 27 36 19 18
30-31/Mar/10 Vox 31 34 15 20
5-9/Abr/10 Sensus Sintrapav 32.4 32.7 18.2 16.8
13-16/abr10 Ibope/DC 29 36 16 19
15-16/abr/10 DataF 28 38 19 15
8-13/Mai/10 Vox 37 34 7 22
10-14/Mai/10 Sensus 35.7 33.2 10.5 20.6
20-21/mai/10 DataF 37 37 12 14
31-03/jun/10 Ibope Globo-EstadoSP 37 37 9 17
19-21/Jun/10 Ibope CNI 40 35 9 16
30/Jun/10 Vox TVBand 40 35 8 16
27-30/Jun/10 Ibope AComercialSP39 39 10 13
30-01/Jul/10 DataF 38 39 10 12
17-20/Jul/10 Vox/IG/TvBand 41 33 9 17
20-23/jul/10 DataF 36 37 11 14