Comment: usually

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In reply to comment: Granger, correct me if I am wrong, (see in situ)

usually

Usually this idea "ethically bound to vote for Republican candidates" is written as the person is bound to support the R candidate. So you can't put a GJ yard sign out front of the house. But you can take your time and energy to support R candidates in local races that you do support.
Then you will be too busy to give any time to the Pres race. And ballots are still secret, so do whatever you want in the voting booth.