I'm not sure whether your problem is your comprehension, your understanding or both but this is yet more twaddle.
Do I personally want to see the UK leave the EU - yes. I'm a communist and believe the UK leaving the EU damages capital, the EU and the UK state. Does that mean I define the working class as those that voted to leave the EU, absolutely not.
I have never done so, in fact I have repeatedly emphasised that the working class is full of contradictions and oppositions. I have repeatedly stressed that their are people that I consider comrades that voted remain, because (again as I have said numerous times) the real divide is not between those that voted leave and those that voted remain but between those that recognise that the working class itself is the only agent really capable of bringing about gains and those that see some body - be that the LP, the state, the EU, the Bolsheviks, the CNT or anybody else - as the agent to protect and/or deliver gains for the working class.
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With regard to the LP I have enough self-awareness to recognise that my political aims and objectives differ from the political objectives of the LP, and in fact are often in opposition to the LP. That does not mean I can't also see that an LP going fully behind remain in the way that the liberal left want has both electoral, and more importantly, political ramifications.
Electorally the position is simple - yes the LP might lose more votes to the LDs/Grns/etc but those votes are in seats that they can afford to lose votes in, for example there are only two Lab->LD marginals in the entire country (and Sheffield Hallam was probably gone ages ago anyway). In contrast, while those the voted leave make up a smaller proportion of Labour's vote, they are distributed such that they are crucial in many of the key marginals that Labour needs to keep/win to form a (majority) government (and I've not see you or anyone else contest, or even address this issue).
Now, I am not arguing that going full remain will not mean a Labour government, in fact if I had to guess the result of a GE in the next few months I predict a Labour (minority) government. But when 15 of the top 10 Lab->Con and Con->Lab marginals are places where there was a majority for leave (in some cases a very large majority) it is head in the fucking sand bullshit to not recognise that pushing a pro-EU line has electoral dangers.
Politically, the ramifications are even more important. The LP has always been a coalition of different interests, and the tensions between those that have an interest (i.e. social or class) based politics and those that have a views (i.e. progressive) based politics are not new. Over the last 30+ years the balance in the LP has moved towards the progressive politics side, and as it has done so the support for the LP in it's old heartlands has dropped.
Despite this some remnants of this class based politics still exist, hence why even in 2010 it was able to count on the bedrock of its support and maintain a 29% vote share and 258 seats (in comparison parties that have embraced the progressive route, e.g. the PS and SDP, are scraping 20% vote shares or less). To move to a pro-EU position is
to push the LP even further down the path of progressive politics. And while I will shed few tears over the LP, I recognise that the removal of class based politics from the LP will open up even more space for national populism to grow.