The margin of sampling error for the complete set of weighted data is plus or minus 4 percentage points. (bankrate.com)
The margin of sampling error for the survey is + / - 4 percentage points with a 95 % level of confidence. (rasmussenreports.com)
However the basic idea you have is a sound one, in principle, because one can use the estimated sampling error of the estimated quantities to construct an expected forecast error distribution. (judithcurry.com)