Paul Krugman puts his finger on the reason for Republicans' refusal to hear evidence in the impeachment trial: it's become a habit of mind.
"Think about what is now required for a Republican politician to be considered a party member in good standing. He or she must pledge allegiance to policy doctrines that are demonstrably false; he or she must, in effect, reject the very idea of paying attention to evidence."
How Zombies Ate the G.O.P.’s Soul https://www.nytimes.com/2020/02/03/opinion/republican-party-trump.html
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