Firstly surely you should absolutely acknowledge that people have an immigration concern. (now you may not believe its justified but all reality is subjective and you have to address peoples concerns not imagine your subjective viewpoint in in-fact objective and that these people are inherently wrong to feel as they do... then you should put forward a credible counter argument that addresses their concerns in a broader context... rather than just say reading between the lines I think they are all racist... and the first thing you need to do to put over an argument is have somebody people will listen to - no point talking all the sense in the world if nobody listens to you.
I find it suspicious that opposition to immigration is highest in the areas where it is least prevalent. But re-education/re-framing
is addressing the concerns. A large number of people are opposed to the foreign aid budget, but Labour shouldn't try to appeal to those people by advocating scrapping it. It should point out that we have a moral duty to help those in need across the planet, and that it constitutes a fraction of our public spending.
Or on immigration you could combat concerns about wage-suppression by campaigning for a genuine living wage.
Zac Goldsmith gave a great example of where appealing to the concerns of voters can lead (despite losing comprehensively, they must have had private polling/focus groups that suggested an anti-Muslim sentiment was worth pursuing. I can't believe the Conservatives plucked that campaign from nowhere).
Secondly if you think the "average voter" and please tell me more about who that is... can be defined as stupid then lets be honest your basically saying over 50% of the population are too stupid to vote for corbyn... surely as somebody who seems to think of them-self in the upper 50% you accept you either have to engage with these people (probably not by calling them stupid) or put somebody up that has enough charisma that they might actually listen to them and engage in the process?
Well I'm assuming the focus groups from a bellwether seat are going to give a reasonable approximation of an average voter. That might be an unfair assumption, and obviously its a small sample size but it coheres with the electoral success of UKIP and the discussion of politics I have experienced first-hand and witnessed on Facebook.
I didn't say anything about being too stupid to vote for Corbyn. I said it was a problem for democracy as a whole that the average voter is so uninformed, and yes, stupid. Governments need to be held to account by the populace. These focus groups reveal a concerning (although not surprising) level of ignorance of politics. And to be fair to me, I'm not calling them stupid to their face nor suggesting that we should

. Plus I have previously admitted to being a shameless left-wing elitist
And it's all very well saying we need to engage with voters, we need to explain things to them. But the excuses for being quite so ill-informed are wearing thin now everyone has a smartphone, everyone has access to internet. Education and social circumstances play a big part, but these focus groups do not consist of un-educated people.
Or is there a third way (perhaps a fourth way as Blair already showed there was a pretty successful third way that I dont imagine you subscribe to) whereby classifying the electorate as uninformed and stupid and persisting with a candidate they have steadfastly refused to engage with wins you an election?
Well possibly. I do find it astonishing that Labour hasn't managed to find a charismatic leader since Blair. As
@Ubik said one of the big takeaways was how popular Blair remains despite "that war stuff". I voted for Corbyn because I broadly agree with him on policy, certainly more than the other leadership candidates, who were not only uninspiring leaders but weren't advocating platforms I believe in.
But I would happily replace Corbyn with a dynamic, exciting, fiery leader advocating similar policies but without the historic baggage.
It seems to me that another lesson that can be drawn from this focus group is that voters are preoccupied with appearance rather than substance. Labour should bear this in mind when choosing its next leader after three consecutive flops in this regard.