My point was that Republican voter's opinions on the Democratic candidate (and vice-versa) shouldn't matter because there's almost no chance they would vote for that candidate anyway. Now if 67% of Democratic voters (the ones who would actually be voting for Biden) are saying he should drop out, then yeah that's significant. Since the article combined all the poll results together it makes it impossible to tell how many people who vote Dem think Biden should drop out, or how many Rep voters think Trump should drop out.

And realistically, you know when this poll was being taken that every single Trump supporter was going to say that Biden should drop out, so that will quickly skew the results. Since those people were never going to cast a vote for Biden anyway, why bother including their opinions here -- except that it makes for a more dramatic headline?