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The Constitution defined a container, but not the content. Nothing in it says that the Senate has to be a partisan body. It has become so by choice, due to a particular political culture. Filling the Senate with non-partisan members is a practical first step to its cultural evolution.
Maybe this is reflective of a general August "chill out" mood swing, but thanks to Richard Linklater and Boyhood, I'm learning to see and accept things as they are, and not put too much weight or thought into the "why." I recognize how little I actually control in life, and how much fun there is in watching it go by, reacting when I need to.