which included a discussion of some of the structural constraints on Trump:
You fail to note one factor not present in the past: social media. Is the government much more permeable and transparent because of it? Remember Nixon's tapes were secret and only revealed by accident. Clinton's emails were hacked. Anyone with a gripe, justified or unjustified, can now find a speaking trumpet. Or does social media tend to empower the more extreme partisans, further dissolving the moderate middle?