All too often, the march of folly has been bicameral, as well as bipartisan.
But the non-Nebraska states have bicameral legislatures for no real reason.
At the national level, we have a bicameral legislature because of the overall workings of the federal system.
bicameral bi·cam·er·al (bī-kām'ər-əl)
Composed of or having two chambers, especially an abscess divided by a septum.