The two rhetorical techniques demonstrated in the passage by Barbara Jordan are:
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Metaphor - The phrase "20th-century paper shredder" serves as a metaphor for discarding the Constitution, suggesting it should be thrown away if it does not serve its purpose.
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Rhetorical conditional - The structure of stating "If the impeachment provision... then perhaps that 18th-century Constitution should be abandoned..." is a clear example of a rhetorical conditional that sets up a hypothetical scenario to emphasize the argument.
So, the correct answers would be metaphor and rhetorical conditional.