The rhetorical techniques demonstrated in the passage by Barbara Jordan are:
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metaphor - The reference to a "20th-century paper shredder" serves as a metaphor for discarding the Constitution if it can't be applied to the current situation.
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rhetorical conditional - The phrase "if the impeachment provision in the Constitution... then perhaps that 18th-century Constitution should be abandoned..." presents a conditional statement that expresses a hypothetical scenario.
So, the correct answers are metaphor and rhetorical conditional.