Final answer:
The recurring theme of the speech is that Americans should have the right to speak their conscience without fear of negative consequences.
Step-by-step explanation:
The recurring theme of the speech 'Remarks to the Senate in Support of a Declaration of Conscience' is that Americans should have the right to speak their conscience without fear of negative consequences. The speech, delivered by Republican Senator Margaret Chase Smith in 1950, criticizes those who engage in the harmful practice of slandering certain Americans based on their political beliefs. Smith argues that the democratic values of freedom of speech and dissent should be upheld, regardless of partisan allegiances.
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