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This would likely make it easier for alternative parties to get a foothold in national politics
This would make politicians' views more transparent, since you don't need to guess what faction of a party they are in
This would make the congress much more resistant to gerrymandering
This would make the Electoral College match the popular vote much more closely
This would make it much easier for citizens to influence their representative
It could be logistically challenging if we don't get much better procedural rules