'The U.K. polls are less sophisticated'
A lot of the US polls in the Republican primaries underestimated Trump's support because they were still using phne or fac-to-face rather than online and voters often don't tell polsters the truth that they are voting for Trump for fear of disapproval, just like shy Tories or shy Kippers.
'People that think they might lose start bleating about a fix in advance.'
No, it is a "Crooked Hillary" strategy aimed at getting that message across and enticing Bernie voters who are angry at the DNC plots against Bernie and who already think that Hillary is crooked. As Scott Adams, Dilbert's creator, says, Trump will win a landslide because of his hypnotic strategy of communicating direct and powerful messages that cut across the media spin and enforce what many people truly think already.
'The voters lost to the electoral roll are unlikely to be Trump voters. '
They were Bernie voters in New York etc, and about 20% of Bernie voters say they will vote for Trump and lots of Bernie voters say theu will not vote for Hillary. Trump also intends to win millions of votes from people who have not voted for years, if ever, just as Brexit won those voters who were immune to Cameron and the team's Establishment spin, fearmongering and dire warnings over Brexit.
'Good on Hillary if she is avoiding Fox. Fox is not a news channel. '
It has the highest viewing figures of any news channel and as we have seen some Republican politicians and stooges will vote for Hillary rather than Trump already. Trump goes on all the left wing media and comedy shows because he has no fear.
'Trump has an enormous amount to hide. Where are his tax returns?'
Yes, but this is minor stuff, nothing sticks on Trump, because Trump fans like him. They know he is a bit like Del Boy, but they liked Del Boy and they like Trump. They have already discounted that Trump is a bullshitter, makes mistakes and cuts corners. They don't care because they know he will sort the Establishment out.