Polling analysis: Corbyn is a liability to Labour while TMay has returned to being an asset to the Tories
The YouGov favourability trackers are just about the only polling where we can compare leaders with their parties on the same basis. The same question is asked in exactly the same form to the same sample whether people have a favourable or unfavourable opinion of CON/LAB/TMay/Corbyn. It is also a tracker which is asked in the same form at regular intervals which means there are enough data points to examine trends. The movement in the leader and party ratings since…