Sens. Ron Johnson, left, and Tammy Baldwin of Wisconsin.

AP Photo/Harry Hamburg

The new Congress, which begins this week, will have five politically-split Senate delegations. Maine, Montana, Ohio, West Virginia, and Wisconsin will have one senator from each party. The small number of split delegations reflects the increased polarization of American politics.

Thirty years ago, it was commonplace for states to send politically-split Senate delegations — composed of both Democrats and...

Continue Reading Five states will have politically-split Senate delegations in the new Congress, reflecting the nation's continued partisan polarization