538 and SurveyMonkey did a poll of white voters to determine which variables were key determinants for the candidate they support. It is NOT income.
The two key variables/factors were education and religion.
Those that attended mass/church service less than weekly were overwhelmingly on the HRC side and those that had a high school degree or less were overwhelmingly on the Trump side.
Next was region. NE was HRC. South was Trump.
Gender was next.
Age
Income