kebabking
Not a Girly Swot, but I like them....
I think 2 things are really going to be the stretching point for Labour, thats Trident and the past record on Northern Ireland...
i don't think NI will have any effect whatsoever - though 'helpful' tweets congratulating Corbyn from Gerry and Martin will be reproduced ad nauseum and won't do anything for his acceptability - the crux issues within Labour will be foreign affairs and defence, because its simply not going to be possible to have a policy that a straight majority of Labour MP's will hold to that comes within a million miles of what Corbyn/McDonnell will accept. the EU ref might well end up as damaging to labour discipline as it will to the tories, there'll be a Syria vote, SDSR15/16, at least one more Trident vote, and then a manifesto in 2020 that either 70% of Labour MP's will disown, or that ignores Corbyns views - in which case, why vote for him..
you can ask John Major about the effect of a widespread party disunity on a party's election chances...