I wouldn’t say polls are meaningless, but the headline and article are still terrible. The article neglects to mention that:
This poll is based on a nationally representative probability sample of 1,027 adults age 18 or older. The sample includes 401 respondents that are currently residents of Arizona.
So about 40% of the respondents live in Arizona which is a major selection bias. I just don’t saw how that can be considered “nationally representative”.
edit:
The margin of sampling error is plus or minus 3.6 percentage points at the 95% confidence level, for results based on the national gen pop sample. The margin of sampling error takes into account the design effect, which was 1.42. For the Arizona gen pop sample, the margin of sampling error is plus or minus 7.1 percentage points, and the design effect is 2.10.
to expand on this:
So about 40% of the respondents live in Arizona which is a major selection bias.