It won’t be like 1972.
Not by a long shot. In 1972 our population of True Believers in socialism was a tiny fraction of what it is now. Today I’d estimate it’s somewhere close to 40% of the population with another 7-8% who could be persuaded to go along.
The only reason Trump will win is that there are still enough of us voters left alive who remember 1972. That will inevitably change over time. This is a much tougher fight than anyone out there seems to think.
Rasmussen has Trump beating Bernie by 8. What that really means is Trump beating Bernie by 12 - 15. It won’t be close.