Standing in the Capitol Rotunda on Monday, President Donald Trump captured the vibes buoying Republicans — and the American right writ-large — as he promised a lengthy list of crackdowns and policy reversals.

“My recent election is a mandate to completely and totally reverse a horrible betrayal,” Trump said. “As our victory showed, the entire nation is rapidly unifying behind our agenda, with dramatic increases in support from virtually every element of our society.”

As he takes office, it can feel like Trump’s movement has the cultural and political upper hand. Republicans won the popular vote in both the presidential and congressional races. Trump’s popularity has never been higher. Broligarchs, celebrities, and big business are lining up behind him.

But another way of looking at it is that Trump’s popularity is probably at its peak — and modern presidents tend to start off their terms with high support before the public gets disillusioned. He did, after all, barely win the election. Republicans only control Congress by tiny majorities. And most of his high-profile policy proposals aren’t as popular as he claims.

Most of the American public isn’t outright rejecting everything Trump is offering (at least, not yet). On at least........

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