Donald Trump may last; he may go away. But the influence of his revolutionary approach to American politics will endure. What he learned and taught about campaigning will be studied and emulated for years to come.
Social media matters. In 2016 his free Twitter feed defeated Hillary Clinton's $1.2 billion fundraising juggernaut.
Foot soldiers don't matter. Clinton was everywhere — every state, most counties. In many states Trump didn't have a single office.