I'm highly skeptical of those polls. With numbers like that, they probably asked the question as: "Should GMO foods be labeled?" If you don't know what a GMO is, you'd probably still say yes, since what's the harm in more information.
In a poll run by Rutgers, only ~8% of respondents said they would want to see GMO foods labeled when asked in an unprompted way (
e.g. "what labels would you like to see on your foods?").
The "right-to-know" labeling movement isn't about providing more information to consumers. They're pissed that the science doesn't support their position and can't push through a full ban, so they instead try to go for these
de facto bans - get a label on it, spread lots of false information to the public to scare them, and then no one will buy GMO foods. Plus, if the public became legitimately informed, they would realize that "organic" and "natural" are total BS terms and that they've been ripped off compared to if they had simply stuck with conventional foods.