A comforting thought, but I am not so certain, for the following reasons:
1. Nixon was monumentally popular in 1972 compared to Trump today (re: Gallup Presidential Approvals).
2. The country has changed. We have been fed a steady diet of socialism in schools and colleges for decades, eroding the arguments against it.
3. McGovern's whole campaign was a fiasco - no mainstream Dem wanted to be his VP (Kennedy, Muskie, Humphrey, etc.), and after choosing Eagleton, he had to replace him at the last minute with Shriver. His convention theatrics were a comedy of errors. None of this will happen with Sanders - the Dem will have a tightly scripted convention as is the case nowadays.
4. The McGovern platform was out of step with the America and even the Democrats of 1972. The Bernie platform is the catechism and creed of modern liberalism.
EXACTLY.