If you run on a promise to vote for certain policies and push for certain policies and support Dem/Lib/Progressive policies and you win and then clearly have no interest in actually supporting the party you belong to there should be a process to have you removed.
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@TalesOfAllSizes Absolutely!! Also if one run as one party then switches to another the governor of the state should have the right/ability to replace them with a member of the party they ran for office under.