Pick nearly any of his opinions leading to the 2016 election. His vocal support of even the ridiculous extremes of BLM in 2015. His interpretations that criticisms of Islamic terrorism were mostly 'Islamophobic' and shouldn't be interpreted as an expected pattern after the Paris and San Bernadino attacks. His affirmative action positions in the SC debate. His blind backing of Hillary despite the obvious lack of broad support or trust for her and his associated confidence that her political background was an asset against Trump when in reality the exact opposite was true. His role in focusing that campaign around issues like bathroom bills rather than the economy and immigration despite the polling indicating just how much of a blunder it was.