Once again, zero evidence of mischievous crossover voting having an impact

South Carolina doesn't have party registration. What proof do you have that Republicans didn't vote in the primary? I'll answer that - none.

The exit polls should provide some info if they ask about party affiliation, but at the moment, unless you know something the rest of us don't, your assertion has no basis.

but they're probably too dumb to figure out how to do it in significant enough numbers to make a difference

This year wasn't going to be any different no matter what Trump called for.

There are always some people who vote in the primary for the party to which they are not affiliated, but 1) the number who do so is small and 2) their votes tend to be distributed (they aren't mischievously coalescing around a certain candidate).

Every 4 years, regardless of which party is having a primary, this discussion gets reenacted.

Calling for something and it actually having a noticeable impact are 2 completely different things.

Historically, there is zero evidence for it having a substantial impact.

But, as with voter fraud, peeps gonna believe what peeps gonna believe.

that include party registration, liberal to conservative self identification, liberal to conservative direction preferred, and whether they’ll vote for the Dem in November.

The numbers may have changed from when I heard the results but at that time there were obvious repugs or repug leaning “no party”s who voted in the Dem primary. Unless there is another way to explain the number who said they wouldn’t vote for the Dem in November.

https://www.cnn.com/2020/02/29/politics/south-carolina-exit-polls/index.html

Right at this time Bernie at 17.9% that’s likely too large....
But if the final is 15.5%, crossover may have pulled Bernie over the threshold