There probably isn’t a better demonstration of the nation’s partisan political polarization than the makeup of the Senate. Only 17 states have split delegations, while 33 states have either two Republicans or two Democrats (or two senators who caucus with the same party, in the case of independents).
Compare those numbers to the Senate makeup three decades ago, and the change is clear. After the 1982 elections, 24 states had split delegations, while 26 had two members of the same party.
Some of the changes show how state (and national) politics have evolved. [cont.]