https://www.cbsnews.com/news/coronavirus-vaccine-half-americ...
How many people does it take to become 'substantial'?
If you didn't read my link, I suggest you do. Plenty of polls are designed in a way that almost encourage terribly inaccurate results.
Perhaps these aren't, but I'm not going to be convinced they're accurate by just a cursory glance at results.
I'm not saying they're necessarily wrong, either - just being skeptical until I see a really strong case.