That reference, of course, is to Trump's famous 2016 campaign claim that his supporters would stick by him even if he pulled out a gun and shot someone on Fifth Avenue in Manhattan. The implication was that Trump could do pretty much whatever he wants and his devotees wouldn't blink. It doubles as an ego trip for Trump and a handy way for journalists and pundits to describe how Trump skates past controversies, no matter how jaw-dropping they are, because his base shrugs. (Rudy Giuliani rekindled it somewhat in a different context.)

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Which got me thinking: How big is the "shoot someone on Fifth Avenue" caucus in America?

The answer I arrived at as anywhere from 1 in 8 to 1 in 5 Americans -- between 12 and 20 percent, around where Miller pegged it. These are the people who seem prepared to justify and/or forgive pretty much anything Trump has done or even has threatened to do. It represents half or less of Trump supporters.

Here's how I arrived at that number.

The Post-ABC poll shows 53 percent of American adults strongly disapprove of Trump, while 24 percent strongly approve. Those numbers are slightly worse for Trump than other recent polls, but it's usually somewhere around 2-to-1 strong-disapprove to strong-approve. Generally, about a quarter of Americans strongly approve of Trump.

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It's notable that the opposition to Trump is more likely to feel that way "strongly" than his support. That suggests that, despite Trump's approval hanging tough around 40 percent for his entire presidency, a significant portion of that isn't completely thrilled with him. Those folks could feasibly at some point be convinced he's gone too far -- whether by shooting someone or for some other reason.

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But that 24 percent also probably oversells the true Trump-or-die supporters. So I sought out other poll findings to see what portion of that 24 percent might be immovable (or something approximating it).

Here's a summary:

12 percent say it's "acceptable for a presidential campaign to obtain information on a political opponent from a hostile foreign power" (Quinnipiac University)

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This probably undersells the Trump-or-die caucus, given Donald Trump Jr. maintains he didn't actually obtain useful information at the Trump Tower meeting with a Kremlin-tied lawyer. Republicans may also be okay with the meeting given many of them don't view Russia as "hostile."

26 percent say Trump should be able to shut down news outlets for "bad behavior" (Reuters)

This oversells the Trump-or-die caucus, given 20 percent of Democrats (!) back a president's ability to do this, and that proportion of Democrats most certainly doesn't back Trump. If you isolate just GOP-leaning voters who favor this approach, it's 16 percent of the total population. Of course, they might just be anti-First Amendment more than pro-Trump. (But still...)

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12 percent say it's not a "big deal" if Russia interferes to help Republicans (Yahoo-SurveyMonkey)

This recent poll asked whether it was acceptable for Russia to try to help the GOP in elections, as the intelligence community says Russia did in 2016. Fully 40 percent of Republicans said it was either "appropriate" or "not appropriate, but wouldn't be a big deal" if Russia did that -- despite foreign involvement in U.S. elections being clearly illegal. Given Trump has said accepting info from Russians would simply be par-for-course in Americans politics, this seems like a telling number as far as how many Americans accept that defense.

22 percent say if Trump shot someone on Fifth Avenue, they would approve of his job performance (Democratic pollster Public Policy Polling)

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Points for asking the question directly, I guess. But it's also a pretty ridiculous hypothetical that respondents probably recognize as such. There have to be some Trump supporters who just answer "yes" out of devotion to Trump, and given what he's said on the topic. Also, "approve" isn't quite the same as saying you would vote for a murderer/gunman.

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15 percent say there is almost nothing Trump could do to lose their support (Public Religion Research Institute)