The murder of Trayvon Martin, probably, specifically when Obama said that if had a son he'd look like Trayvon.
A lot of people were fine voting for a black president, but not a Black president.
Id say Ferguson was really when they lost that voter
Hey, don't blame this all on me! /s
Obama won those same voters literally the year Trayvon Martin happened
Dick Morris predicted that Obama would lose because he said that Trayvon Martin could have been his son. When Morris’s prediction proved to be wrong, people thought that racial tensions were a thing of the past.
While a lot of voters support ending endless wars, when those countries collapse (or nearly do) without our presence, public opinion really shifts. I can remember people not wanting us to intervene in Syria in 2013 only become major hawks on ISIS two years later.
Rand Paul was a rising star in the GOP before the rise of ISIS.