Most Republican politicians since Nixon have pandered to racism, just more subtlely, with code words like "welfare" and "entitlements" and locking up about 1 million African American men & boys.
For several decades, the GOP and their hate media have whipped up fear & prejudice, concentrated on the most easily fooled voters:
the racist, anti-science, uneducated, low-information, the god-botherers.
From Nixon's Southern Strategy through Reagan's Welfare Queens to Dubya's wars.
Atwater & Rove plotting.
The Tea Party rising.
The GOP succeeded in creating their desired idiocracy - but now their idiots are voting for Trump, instead of the GOP's chosen idiot.
Own. Arse. Shot. Bloodily.