I can tell you that in solid Red States many people choose a party so they can vote in its primary, not necessarily because they like that party or vote with them in the general election. That can also mean they have two opportunities to display biases, and different balances can result each time.
For instance a retired white lady might choose to vote for a slightly less conservative, younger Republican in the primary, then find she has to choose between someone she has seen way too many unfavorable news stories about or someone on the other side who she finds personally repugnant, who she voted against in the primary. If she has a longstanding belief that her friends would never vote for a woman, and then some late breaking news cements her unfavorable view, she might vote for Mr. Repugnant, or stay away from the polls, or just not vote for President.
She may be suburban, upper middle class, educated and liberal and still end up feeding into the Trump machine, even if she was never on FB (but of course she was).
Of course now she's horrified, and time has wiped her 2016 decision making process from her mind. But what to do? Just hope no one poisons the D candidate before the election? Protest? She's in a red state, remember. Everyone watches Fox, and her FB feed is still a mess of trolls and bots and algorithms.
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