Agreed there problem is when your initial momentum comes from that group it's incredibly hard to shake off. Even now a small minority are doing wonderso for tarring 52% of the country.
Just argued on Facebook the accusations that Cameron told remain to not attack Gove and Boris to much makes perfect. Attacking people invigoratesay supporters not diseases them.
What really didn't help the remain campaign was the Labour leadership committing to a very feeble campaign in support of the government but then Corbyn has always been a Euro sceptic