Republicans aren't the lesser of two evils, they are the demise of our democracy & republic (that's bad). Our system does allow for third parties but the system has been rigged by the duopoly to make election difficult for alt candidates. Our system is fixable if we keep duopoly out of the process.
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A proportional voting system would need to be implemented to get around this fact, but neither party has it in their interest to do so (plus it would be unconstitutional).