In my rust-belt state I saw Bernie signs everywhere during the primaries, on front lawns, on car bumpers, etc. I saw a grand total of one Hillary sign. Yet Hillary won my state's primary easily. It wasn't even close.
I hope Trump's campaign realizes that he just can't afford any more mistakes from here on in. Do not feed the media monster.
You make a good point. The same thing happened here in Florida, Hillary won, despite no apparent outward support. That left the Bernie supporters furious and feeling they had been cheated.
You should take comfort however in some interesting facts:
Here in Florida 2,361,805 voters turned out to vote Republican. Of those, 1,079,183 voted for Trump when there 13 candidates on the R primary ballot.
By contrast only 1,709,183 turned out to vote in the Dem primary. Of those, 1,101,414 voted for Clinton with 3 candidates on the D ballot.
As you can see we just need the Republicans to rally 100% behind Trump to bury Clinton once and for all. I also believe Trump is going to pick up many cross over votes from the Dems just as Reagan did.
On another note I have never seen so many black voters (at least here in Florida) be so energized to vote for a rich white guy.