Dylan Matthews writing in Vox on public opinion polling regarding the issue of immigration:
While the polling on the DREAM Act and the border wall is compellingly consistent, there’s plenty of reason to believe people don’t have durable political ideologies and largely copy their views from political elites. As the USC political scientist Morris Levy told the New York Times’s Thomas Edsall, “The great majority of Americans do not hold clear, stable, well-defined positions on almost any of these issues.”
Here are the two books that Matthews links to above: