When they do a poll of "likely to vote" that is worth watching, but it costs a lot and needs a large sample base to crate any meaningful notations, except in micro-polling which is why the campaigns spend so much on "internal" polling.
I know what you’re saying. I’m more concerned if FReepers get suckered on such polling. We ought not even post polling data on races here unless they are explicitly stated to be “likely voters.”