Opinion polls are useful when they are used to drill down into why something happened. For example this report:
Explaining White Polarization in the 2016 Vote for President: The Sobering Role of Racism and Sexism
http://people.umass.edu/schaffne/schaffner_et_al_IDC_conference.pdf
In this report they provide insight into why Trump won. Polling data is presented with statistical analysis and back-up data to show the results are consistent with other studies that are independent of this one. The study looks at a result in several ways to help the reader understand the conclusions of the report.
What you present is some open ended opinion poll based upon an open ended question and you use it to make a prediction. What you say is: 60% want free health care therefore "the country will support universal healthcare". What you left out is, when the same question is asked but framed with increasing taxes or government control, the result flips to 60% against. I'm not calling you a liar, I think you didn't know that. I think you stopped reading when you found the answer you wanted, in other words you are blinded by confirmation bias.
You use opinion polls stupidly, Pad. Like the drunk leaning against the light pole, using it for support instead of illumination.