As remarkably, the question about Oz’s favorable rating came after the pollster asked a separate question about the impact of Trump’s endorsement of Oz (voters generally said it was more a positive than a negative). So when asked for their opinion on Oz, voters would have been primed to know that he was the candidate backed by Trump — favorability split: 80-18 — and still the best Oz could manage was 45-46.
It’s very rare for a politician to be more disliked than liked inside their own party, or even to be near an even split. (A handful of Republicans in recent years have seen their numbers inside the GOP flip upside down, but generally after breaking with Trump in some high-profile way.) And it would of course be even rarer for such a Republican to somehow still win their party’s nomination — which Oz might, by virtue of competing in a crowded field.
Precisely what that would mean for Oz’s general election prospects remains to be seen, in part because we don’t have much general-election polling. Not only do many Republicans dislike him, but plenty hold that opinion “strongly” — 28 percent in the Fox poll and 24 percent in the F&M poll. He would have to win those people over in a closely divided state.