Some perception of political retribution might be unavoidable, but that's not enough to render such a measure unconstitutional. It's well established that the impassioned remarks and subjective intentions of scattered members of Congress don't suffice to condemn as a purely punitive enactment an otherwise valid regulatory or tax measure. If the law were otherwise, it would be much too easy for lawmakers to doom laws with poison-pill remarks.
I don't know how to judge the likelihood of the Tribe's hypothetical in the last sentence, but the first point Tribe makes here seems like a good one: the intention of an individual lawmaker that support a bill is not synonymous with the bill's "legislative intent." Assuming Tribe is right on the attainder doctrine (and I have every reason to believe he is) , I think I was wrong in my original post.
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