Strictly Speaking, the Social Weather Stations Survey of 2-3 May 2013--its Final Pre-election survey of 2400 randomly sampled registered voters--correctly predicted the final RANKING of only 3 out of the 33 Senatorial Candidates (though it correctly predicted the composition of the Magic 12).
SWS
SURVEY
SWS
RANKING
HITS
COMELEC
RANKING
VOTES
FOR SENATOR
57
LEGARDA
0
POE
20147423
50
CAYETANO
0
LEGARDA
18482961
48
BINAY
0
CAYETANO
17408543
48
ESCUDERO
1
ESCUDERO
17332952
45
POE
0
BINAY
16645515
44
EJERCITO
0
ANGARA
15858995
44
VILLAR
0
AQUINO
15388992
43
PIMENTEL
1
PIMENTEL
14584612
41
AQUINO
0
TRILLANES
13995603
38
ANGARA
0
VILLAR
13696120
38
TRILLANES
0
EJERCITO
13552991
37
HONASAN
1
HONASAN
13070031
35
ENRILE
0
GORDON
12364091
33
JMAGSAYSAY
0
ZUBIRI
11707146
33
ZUBIRI
0
ENRILE
11419246
29
HONTIVEROS
0
MAGSAYSAY
11252335
27
GORDON
0
HONTIVEROS
10840047
25
MADRIGAL
0
HAGEDORN
8323835
16
HAGEDORN
0
VILLANUEVA
6868774
15
VILLANUEVA
0
MADRIGAL
6727877
14
MACEDA
0
MAGSAYSAY
5569077
13
MMAGSAYSAY
0
CASINO
4254245
11
COJUANGCO
0
MACEDA
3388936
9
CASINO
0
COJUANGCO
3091642
4
MONTANO
0
ALCANTARA
1227521
3
ALCANTARA
0
DELOS
REYES
1226470
3
DELOSREYES
0
BELGICA
1118829
3
DAVID
0
PENSON
1030107
2
PENSON
0
MONTANO
1029439
2
FALCONE
0
DAVID
1026096
2
LLASOS
0
SENERES
698440
2
BELGICA
0
LLASOS
695260
1
SENERES
0
FALCONE
659073
SWS
SURVEY of 2400 voters

2,3 May
HIT
RATIO
3/33
COMELEC
CANVAS #16
ACTUAL
VOTES WON