The Left wanted Nixon impeached in his first term, long before Watergate.
They didnt want Reagan sworn in and wanted to pursue impeachment over Iran Contra in his second term. They wanted Bush out in his first term because of conspiracies about the 1980 hostages release. They wanted Bush II out in his first term and wanted Abu Ghraib as the excuse.
The peaceful transfer of power was gone by 1960.
Nixon was the precedent.
The left would have sought to impeach Nixon over his role in the McCarthy hearings, had he won in 1960.
“The peaceful transfer of power was gone by 1960.”
Bingo.
It is coincident with the link-up of the Democrats and the Communist Party.