I think this is an excellent rationale for why everyone (outside of residents of Pennsylvania) should support the Green Bay Packers in the Superbowl:

I realize that people who live or have lived in Pittsburgh and in Pennsylvania generally will support the Steelers.

I urge everyone else to support the Packers.   Liberals should like them because they aren’t owned by some rich capitalist; rather, they are publicly owned.  Conservatives should like them because they represent small town America.  Let’s make this a campaign for national unity (except for Pittsburgh).

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