It is the media and short election cycles. The politicians who serve long terms(senate) generally get along with each other because they have to work together,

It is the media and short election cycles. The politicians who serve long terms(senate) generally get along with each other because they have to work together, while members of the house and the president must keep media frenzy since they are constantly in election mode. Also, if you pay attention - it is no longer left vs right, more like localism vs globalism. Of course media portrays localism as nationalism, and globalism as progressivism