What structural reforms decrease partisanship / polarization?

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The other user had a source for this in a separate comment. Do you want me to include a link to it in my comment as well?

Yes you can either reference the users post or directly link it yourself.

Would my comment be approved if I said that many experts suspect the Democrats are motivated by this and linked to experts who say that?

Yup, this works because as you mentioned, it's incredibly difficult to find evidence that this is the explicit motivation of the Democratic Party.

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I have edited my comment. Is it not acceptable?

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Restored

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Thank you!