I suspect that this is currently the case, as folk recover from their disappointment (I'm certainly disappointed). However, as the election draws nigh, folk (who would normally vote) will likely gravitate toward making a choice.
My parents voted for McGovern in June of 1968. Although they were disappointed that McGovern didn't get the nomination, they voted for Humphrey in November of 1968. They told me that they knew some McGovern supporters that refused to vote in November, or only voted for down-ballot candidates. It is possible that millions of McGovern supporters thought like this, allowing Nixon to become president.
I sincerely hope that history doesn't repeat itself this year.
That being said, Nixon was a genius saint compared to Trump.
