So, you suspect the poll might not be credible? Other polls, though not as supportive of the guest worker idea, show no overwhelming opposition to the idea. CNN finds 77% support the idea. Do you really think they're off by over 25% in gaging the opinion of American adults? I don't think so.
In my history of posting on FR, I've never thought any poll put out by CNN is credible.
This is is no different, just because you happen to like the results.