Polling "house effects": How much each firm differs from the average for each party
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Con
Lab
Lib Dem
UKIP
Created with Raphaël 2.1.2
Populus
1.3
ICM
0.5
Ipsos-MORI
-0.7
Lord Ashcroft
0.6
ComRes phone
0.3
ComRes online
1.9
YouGov
-0.8
Opinium
-1.8
Survation
2.3
Populus