Is Paul Mason Goading Jeremy Corbyn And Labour With This Progressive Alliance Video?

It would be difficult to accuse Paul Mason of sitting on the fence when it comes to politics.
A vocal Jeremy Corbyn supporter, the former broadcast journalist-turned commentator has never shied away from saying where his loyalties lie, defending the Labour leader against attacks from ‘biased’ media outlets. 
But in a video uploaded by Compass - the organisation behind the Progressive Alliance campaign encouraging people to vote for the party most likely to beat the Tories in the