Nature of the beasts. Republicans have the agenda of making the top 1% rule the world. They can work with a single goal in mind. Democrats have a calling to include a bunch of completely unrelated groups under one tent. Such a group is going to rock and tumble now and then. But that is one of the things I like about them.
Democracy is a noisy business, but I love it.
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"Jelly-belly gigglin, dancin and a-wigglin, honey that's the way I am!" Janice the Muppet