40% of Republicans say that they will never vote for Trump. It will be hard for Trump to win with only crossover Democrats.
Besides, none of the states Trump has won has he gotten over 50%
The GOP is more divided with Trump or Cruz than they were with Romney and he lost. And the polls were pretty accurate in 2012 and people here were dismissing those as well
There are a lot of republicans that are anti-Trump, but I also think there are a fair number of Bernie supporters that won’t vote for Hillary. So it’s going to be interesting.